APA (7th ed.) Citation

Frey, R. L., & Schrenk, L. P. (1985). Northern Pacific Railway. Golden West Books.

Chicago Style (17th ed.) Citation

Frey, Robert L., and Lorenz P. Schrenk. Northern Pacific Railway. San Marino, Calif.: Golden West Books, 1985.

MLA (9th ed.) Citation

Frey, Robert L., and Lorenz P. Schrenk. Northern Pacific Railway. Golden West Books, 1985.