APA (7th ed.) Citation

Alexander, E. P. (1947). The Pennsylvania Railroad: A pictorial history. W.W. Norton.

Chicago Style (17th ed.) Citation

Alexander, Edwin P. The Pennsylvania Railroad: A Pictorial History. New York, NY: W.W. Norton, 1947.

MLA (9th ed.) Citation

Alexander, Edwin P. The Pennsylvania Railroad: A Pictorial History. W.W. Norton, 1947.