APA (7th ed.) Citation

Pine, D., Pine, D., & Siegener, R. (1980). Fitness for couples. Contemporary Books.

Chicago Style (17th ed.) Citation

Pine, David, Dale Pine, and Ray Siegener. Fitness for Couples. Chicago: Contemporary Books, 1980.

MLA (9th ed.) Citation

Pine, David, et al. Fitness for Couples. Contemporary Books, 1980.