“A.J. Cassatt Dies: Of Grief, Friends Say: Pennsylvania President’s Heart Broken by Graft Exposures. The End Comes Suddenly: Family Thought He Was Sleeping -McCrea or Rea May Succeed Him -- Frick’s Post.” New York Times. December 29, 1906.

Aldrich, Mark. “The Great Sidetrack War: In Which Downtown Merchants and the Philadelphia North American Defeat the Pennsylvania Railroad, 1903–19041.” The Journal of the Gilded Age and Progressive Era 13, no. 4 (October 1, 2014): 500–531.

“Alexander J. Cassatt, NYT 1899-06-18.” New York Times, June 18, 1899.

“Alexander Johnston Cassatt biography.” In Dictionary of American Biography. U.S. History in Context. galegroup.com: New York: Charles Scribner’s Sons, January 1, 1936.

Boies, David. “Experiment in Mercantilism: Minimum Rate Regulation by the Interstate Commerce Commission.” Columbia Law Review 68, no. 4 (April 1, 1968): 599.

Carlson, Robert E., and Patricia T. Davis. “Review - End of the Line: Alexander J. Cassatt and the Pennsylvania Railroad - Robert E. Carlson.” Technology and Culture 20, no. 1 (January 1, 1979): 228.

“Cassatt Converts Penrose: Pennsylvania Senator Now Prepared to Support Rate Legislation.” New York Times. December 19, 1905.

“Cassatt Funeral To-Day: New President of the Pennsylvania May Be Chosen Wednesday.” New York Times. December 31, 1906.

“Cassatt Has No Stock in Coal Companies: So Informs Pennsylvania Road’s Investigating Committee. Has Never Received Gifts: Enumerates the Securities in Various Enterprises He Does Own and Those He Has Sold.” New York Times. June 11, 1906.

“Cassatt, Hill, McCrea Types of Railroad President: Contrasted Ideas of Great Transportation Organizers Extensive Intensive Development What Will Be Policy of the Pennsylvanias New Head?” New York Times. January 6, 1907, sec. Magazine Section.

“Cassatt Hurries Home from European Trip: Disclosures at Pennsylvania Road Inquiry the Reason. More Accusations Made: One Railroad Investigating Committee Member Said to Hold Coal Stock Himself.” New York Times. May 26, 1906.

“Cassatt Not to Profit by Immunity Clause: Commission Indicates It Will Not Call on Him to Testify. He Ousts Grafting Clerk: Another Employe with Small Salary Admits Getting $75,000 -- More Dismissals Expected.” New York Times. June 8, 1906.

“Cassatt Says Inquiry Would Please His Road: No Objection to Investigation of Alleged Pennsylvania Merger. Has Conference with Baer: Tillman Would Not Trust Commerce Commission or Bureau of Corporation to Make Inquiry.” New York Times. February 11, 1906.

“Cassatt Tells Detail of Pennsylvania Plans: Opposes a Fixed Charge on New York Connecting Railroad. WILLING TO PAY FULL TAXES Additional Imposts Might Cause Loss to City by Hindering Project -- Where Yards Will Be.” New York Times. January 22, 1906.

“Cassatt Will Is Filed: Estate of More Than $5,000,000 Divided Among His Family.” New York Times. January 8, 1907.

“Cassatt Wins Two Races at Belmont: Philadelphian’s Flying Fairy and Spring Board Best in Hard Races.” New York Times. June 9, 1914.

“Cassatt’s Successor May Be James McCrea: Pittsburg Hears That the Decision Has Been Reached. Cassatt Soon to Quit Work: Understood He Will Go South and That Samuel Rea Will Act Till He Retires.” New York Times. October 28, 1906.

Chappell, Sally A. Kitt. “Urban Ideals and the Design of Railroad Stations.” Technology and Culture 30, no. 2 (April 1, 1989): 354.

Church, Samuel Haden. “A Short History Of Pittsburgh 1758-1908,” November 16, 1907.

Churella, Albert J. “Review - Machine, Monument, and Metropolis: New York’s Pennsylvania Station.” Technology and Culture 45, no. 4 (October 1, 2004): 817–23.

“Col. Edw. B. Cassatt Dies Suddenly at 53: Soldier and Prominent Sportsman Was Son of the Late A.J. Cassatt.” New York Times. February 1, 1922.

Collins, Glenn. “40 Years After Wreckage, Bits of Old Penn Station; Ghosts of a New York Marvel Survive.” New York Times, October 28, 2003.

HathiTrust. “Communication to Hon. George B. McClellan Mayor and Hon. Alexander E. Orr President Rapid Transit Board / from A.J. Cassatt President of the Pennsylvania ...,” January 18, 1906.

Condit, Carl W., and Lorraine B. Diehl. “Review:  The Late, Great Pennsylvania Station.” Technology and Culture 28, no. 4 (October 1, 1987): 885.

Couper, Wm. History of the Engineering, Construction and Equipment of the Pennsylvania Railroad Company’s New York Terminal and Approaches... New York: Isaac H. Blanchard company, 1912.

Cuomo’s Vision for Penn Station: Goodbye, MSG Theater; Hello, Empire Station Complex, 2016.

David Dunlap. “A Quest for Fragments of the Past; Calling Penn Station’s Scattered Remains Back Home.” New York Times, August 6, 1998.

Davis, Patricia Talbot. End of the Line: Alexander J. Cassatt and the Pennsylvania Railroad. New York: Neale Watson Academic Publications, 1978.

Drutchas, Geoffrey G. “Gray Eminence in a Gilded Age: The Forgotten Career of Senator James McMillan of Michigan.” The Michigan Historical Review 28, no. 2 (January 1, 2002): 78.

“End of an Error.” Preservation, April 1, 1999.

Giordano, Jeanne. “Review:  Gateway to Metropolis: New York’s Pennsylvania Stations.” Journal of the Society of Architectural Historians 59, no. 4 (December 1, 2000): 525–27.

Gratton, Brian. “‘A Triumph in Modern Philanthropy’: Age Criteria in Labor Management at the Pennsylvania Railroad, 1875–1930.” Business History Review 64, no. 04 (December 1, 1990): 630–56.

Jonnes, Jill. Conquering Gotham: A Guilded Age Epic : The Construction of Penn Station and Its Tunnels. New York: Viking, 2006.

Klepper, David. “Cuomo Pitches Rail Tunnel to Trump in ‘productive’ Meeting.” AP NEWS, November 28, 2018.

Martin, Albro, and Freeman Hubbard. “Review:  Encyclopedia of North American Railroading: 150 Years of Railroading in the United States and Canada.” Technology and Culture 24, no. 4 (October 1, 1983): 692.

“McCrea Is Elected to Succeed Cassatt: Pledged to the Policy of Former Pennsylvania Presidents. BOARD ADOPTS RESOLUTIONS Memorializes Mr. Cassatt as a Great Road Builder Who Realized Future Needs -- Left All to Family.” New York Times. January 3, 1907.

“McCrea Most Likely to Succeed Cassatt: Talk of Pennsylvania President Centres on Him. Cassatt Funeral Private: Widow Decides Against Public Church Services -- Burial to Be at Bryn Mawr -- Trains Not to Stop.” New York Times. December 30, 1906.

McShane, Larry. “Penn Station’s Buried Glory.” nydailynews.com, April 20, 2008. https://www.nydailynews.com/new-york/penn-station-buried-glory-article-1.282161.
“Mr. Cassatt’s Statement.” New York Times. June 12, 1906.

New York Documentary, 2010.

O’Grady, Jim. “How To Survive, And Occasionally Thrive, In New York Penn Station, The Continent’s Busiest Train Hub,” August 7, 2012.

Old Penn Station New York City with Aerial & Skyline Views of Manhattan & Empire State Building Etc., 2009.

Palaces, Jerry’s Brokendown. “Jerry’s Brokendown Palaces: Madison Square Garden IV, 4 Penn Plaza (between 7th and 8th), New York, NY.” Jerry’s Brokendown Palaces (blog), June 22, 2012.

“Pennsylvania Heads Find Station Ready: President McCrea and 200 Officials Make Final Inspection Before Nov. 27 Opening. 116 TRAINS DAILY AT FIRST The Big Expresses Alone at the Outset Will Use New Terminal, Local Trains Using the Jersey City Station.” New York Times. November 19, 1910.

“Pennsylvania Opens Its Great Station: First Regular Train Sent Through the Hudson River Tunnel at Midnight. 2,000 Persons See It Start: Vast Concourse Thronged During the Evening by Sightseers and Travelers -- New Schedule Begun Without Hitch.” New York Times. November 27, 1910.

Pennsylvania railroad company. [from old catalog]. “Pennsylvania Station in New York City.” Pennsylvania R.R., January 1, 1910.

Phillips, Don. “The Battles of Manhattan Railroading Are Different Today.” Trains 69, no. 7 (July 1, 2009): 10.

Piece Of New York’s Original Penn Station Hides In Plain Sight ... Inside Today’s Penn Station - WNYC, 2012.

“Piece Of New York’s Original Penn Station Hides In Plain Sight ... Inside Today’s Penn Station - WNYC,” August 7, 2012.

Review - Conquering Gotham - A Gilded Age Epic - The Construction of Penn Station and Its Tunnels - Carol Poh, 2008.

“President Cassatt Tells Tunnel Plans: To Save Half an Hour Between New Jersey and Manhattan. Head of Pennsylvania System Testifies Before Commission That Will Hear Property Owners’ Complaints.” New York Times. March 25, 1903.

“Proceedings of the Academy of Natural Sciences of Philadelphia - Feb 5, 1907.” Proceedings of the Academy of Natural Sciences of Philadelphia 59, no. 1 (February 5, 1907): 23–23.

“Public Relations and Technology: The ‘Standard Railroad of the World’ and the Crisis in Railroad Safety, 1897-1916 on JSTOR,” January 1, 2007.

Schramm, Jeff. “The Pennsylvania Railroad. Volume 1: Building an Empire, 1846–1917 by Albert J. Churella (Review).” Technology and Culture 55, no. 1 (March 7, 2014): 258–59.

Secrets of Penn Station - WNYC Radio - YT.Mp4, 2013.

WNYC. “See How a Post Office Gets Turned into a Train Station | WNYC | New York Public Radio, Podcasts, Live Streaming Radio, News,” August 17, 2017.

STAFF, Joseph S. Kennedy INQUIRER SUBURBAN. “Pennsylvania Railroad Came of Age under Legendary Leader Alexander Johnston Cassatt Helped Elevate the Line to a New Level of Prominence. LOCAL HISTORY.” Philly.com, January 12, 2003.

“Staunton Spectator and Vindicator 4 January 1907 — Virginia Chronicle,” January 4, 1907.

The Destruction of Penn. Station - YouTube, 2013.

“The Project Gutenberg EBook of THE NEW YORK TUNNEL EXTENSION OF THE PENNSYLVANIA RAILROAD, by B.F. Cresson, Jr.,” September 1, 1910.

The Punxsutawney Spirit. “Death Was Unexpected,” January 2, 1907.

“The Big Coal Five.” The Punxatawney Spirit, September 24, 1902.

Times, Special to The New York. “Mrs. Emily Cassatt to Wed: Former Wife of Railroad Man’s Son to Marry G.E. Batcheller.” New York Times. May 2, 1905.

“President Cassatt Talks: Pennsylvania Will Make Contracts for Tunnel Work Here Without Delay.” New York Times. March 11, 1904.

“Transactions of the American Society of Civil Engineers, Vol. LXVIII, Sept. 1910, by B.F. Cresson, Jr.,” January 1, 1910.

Yaro, Robert D. “Building Gotham: Civic Culture and Public Policy in New York City, 1898-1938.” Journal of the American Planning Association 71, no. 3 (July 1, 2005): 350–51.