APA (7th ed.) Citation

Stephen, L., & Ullmann, S. O. A. (1956). Men, books and mountains. Minnesota U.P..

Chicago Style (17th ed.) Citation

Stephen, Leslie, and S O A. Ullmann. Men, Books and Mountains. Minneapolis: Minnesota U.P., 1956.

MLA (8th ed.) Citation

Stephen, Leslie, and S O A. Ullmann. Men, Books and Mountains. Minnesota U.P., 1956.