APA (7th ed.) Citation

Willke, J. C., & Willke, B. (1990). Abortion: Questions & answers (Rev. ed.). Hayes.

Chicago Style (17th ed.) Citation

Willke, Jack C., and Barbara Willke. Abortion: Questions & Answers. Rev. ed. Cincinnati, Ohio: Hayes, 1990.

MLA (9th ed.) Citation

Willke, Jack C., and Barbara Willke. Abortion: Questions & Answers. Rev. ed. Hayes, 1990.