APA (7th ed.) Citation

Gunn, T., & Gunn, A. (1966). Positives. University of Chicago Press.

Chicago Style (17th ed.) Citation

Gunn, Thom, and Ander Gunn. Positives. Chicago: University of Chicago Press, 1966.

MLA (9th ed.) Citation

Gunn, Thom, and Ander Gunn. Positives. University of Chicago Press, 1966.