Silber, S. J., & Barrows, S. (1987). How not to get pregnant: Your guide to simple, reliable contraception. National Book Store.
Citazione stile Chigago Style (17a edizione)Silber, Sherman J., e Scott Barrows. How Not to Get Pregnant: Your Guide to Simple, Reliable Contraception. Manila: National Book Store, 1987.
Citatione MLA (9a ed.)Silber, Sherman J., e Scott Barrows. How Not to Get Pregnant: Your Guide to Simple, Reliable Contraception. National Book Store, 1987.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.