APA (7th ed.) Citation

Zelnik, M., Kantner, J. F., & Ford, K. (c 1981). Sex and pregnancy in adolescence. Sage library of social research.

Chicago Style (17th ed.) Citation

Zelnik, Melvin, John Frederick Kantner, and Kathleen Ford. "Sex and Pregnancy in Adolescence." Sage Library of Social Research c 1981.

MLA (9th ed.) Citation

Zelnik, Melvin, et al. "Sex and Pregnancy in Adolescence." Sage Library of Social Research, c 1981.