APA (7e ed.) Bronvermelding

Alba, J. R. (1991). Natural birth control for avoiding or achieving pregnancy: The dry or wet method (2nd ed.). Alba Natural Family Planning Organization.

Chicago (17e ed.) Bronvermelding

Alba, Jose R. Natural Birth Control for Avoiding or Achieving Pregnancy: The Dry or Wet Method. 2nd ed. Makati, Metro Manila: Alba Natural Family Planning Organization, 1991.

MLA (9e ed.) Bronvermelding

Alba, Jose R. Natural Birth Control for Avoiding or Achieving Pregnancy: The Dry or Wet Method. 2nd ed. Alba Natural Family Planning Organization, 1991.