ebrary, Inc, & Shoupe, D. (2011). Contraception. Wiley-Blackwell.
Cita Chicago (17th ed.)ebrary, Inc, i Donna Shoupe. Contraception. Chichester, West Sussex: Wiley-Blackwell, 2011.
Cita MLA (9th ed.)ebrary, Inc, i Donna Shoupe. Contraception. Wiley-Blackwell, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.