APA (7th ed.) Citation

Frey, R. L. (1988). Railroads in the nineteenth century. Facts on File.

Chicago Style (17th ed.) Citation

Frey, Robert L. Railroads in the Nineteenth Century. New York: Facts on File, 1988.

MLA (9th ed.) Citation

Frey, Robert L. Railroads in the Nineteenth Century. Facts on File, 1988.