APA (7th ed.) Citation

Horrabin, J. F. (1942). An outline of political geography. A.A. Knopf.

Chicago Style (17th ed.) Citation

Horrabin, J. F. An Outline of Political Geography. New York: A.A. Knopf, 1942.

MLA (9th ed.) Citation

Horrabin, J. F. An Outline of Political Geography. A.A. Knopf, 1942.