APA Citation

(1980). The billings method: A method of natural family planning. [Lugar de publicación no identificado]: Family of the Americas Foundations.

Chicago Style Citation

The Billings Method: A Method of Natural Family Planning. [Lugar de publicación no identificado]: Family of the Americas Foundations, 1980.

MLA Citation

The Billings Method: A Method of Natural Family Planning. [Lugar de publicación no identificado]: Family of the Americas Foundations, 1980.

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