Cita APA (7th ed.)

Alba, J. R., & Alba, R. C. (1990). Natural birth control for avoiding or achieving pregnancy: The dry or wet method (the ovulation or vaginal mucus method) (3rd ed.). Alba Natural Family Planning Organization.

Cita Chicago (17th ed.)

Alba, Jose R., i Rey C. Alba. Natural Birth Control for Avoiding or Achieving Pregnancy: The Dry or Wet Method (the Ovulation or Vaginal Mucus Method). 3rd ed. Makati, Metro Manila: Alba Natural Family Planning Organization, 1990.

Cita MLA (9th ed.)

Alba, Jose R., i Rey C. Alba. Natural Birth Control for Avoiding or Achieving Pregnancy: The Dry or Wet Method (the Ovulation or Vaginal Mucus Method). 3rd ed. Alba Natural Family Planning Organization, 1990.