APA Citation

Cogan, B., & Cogan, B. (1900). An introduction to natural family planning. [Lugar de publicación no identificado]: [editor no identificado].

Chicago Style Citation

Cogan, Bill, and Bill Cogan. An Introduction to Natural Family Planning. [Lugar de publicación no identificado]: [editor no identificado], 1900.

MLA Citation

Cogan, Bill, and Bill Cogan. An Introduction to Natural Family Planning. [Lugar de publicación no identificado]: [editor no identificado], 1900.

Warning: These citations may not always be 100% accurate.