APA (7th ed.) Citation

Willke, J. C., & Willke, B. (1964). The wonder of sex: How to teach children : a guide for parents and teachers. Hiltz Pub. Co..

Chicago Style (17th ed.) Citation

Willke, J. C., and Barbara Willke. The Wonder of Sex: How to Teach Children : A Guide for Parents and Teachers. [Cincinnati: Hiltz Pub. Co., 1964.

MLA (8th ed.) Citation

Willke, J. C., and Barbara Willke. The Wonder of Sex: How to Teach Children : A Guide for Parents and Teachers. Hiltz Pub. Co., 1964.