APA (7th ed.) Citation

Billings, E., & Westmore, A. (1982). Método Billings: Control natural de la fertilidad. Gedisa.

Chicago Style (17th ed.) Citation

Billings, Evelyn, and Ann Westmore. Método Billings: Control Natural De La Fertilidad. Barcelona: Gedisa, 1982.

MLA (9th ed.) Citation

Billings, Evelyn, and Ann Westmore. Método Billings: Control Natural De La Fertilidad. Gedisa, 1982.

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