APA (7th ed.) Citation

Callahan, S., & Callahan, D. (1984). Abortion: Understanding differences. Plenum Press.

Chicago Style (17th ed.) Citation

Callahan, Sidney, and Daniel Callahan. Abortion: Understanding Differences. New York [u.a.]: Plenum Press, 1984.

MLA (8th ed.) Citation

Callahan, Sidney, and Daniel Callahan. Abortion: Understanding Differences. Plenum Press, 1984.