APA (7th ed.) Citation

Steffen, J. O. (1980). Comparative frontiers, a proposal for studying the American West. University of Oklahoma Press.

Chicago Style (17th ed.) Citation

Steffen, Jerome O. Comparative Frontiers, a Proposal for Studying the American West. Norman: University of Oklahoma Press, 1980.

MLA (9th ed.) Citation

Steffen, Jerome O. Comparative Frontiers, a Proposal for Studying the American West. University of Oklahoma Press, 1980.