APA (7th ed.) Citation

Sale, R. D., & Karn, E. D. (1979). American expansion: A book of maps. University of Nebraska Press.

Chicago Style (17th ed.) Citation

Sale, Randall D., and Edwin D. Karn. American Expansion: A Book of Maps. Lincoln, Neb.: University of Nebraska Press, 1979.

MLA (9th ed.) Citation

Sale, Randall D., and Edwin D. Karn. American Expansion: A Book of Maps. University of Nebraska Press, 1979.