APA (7th ed.) Zitazioa
Speroff, L., & Darney, P. D. (2011). A clinical guide for contraception (Fifth edition.). Wolters Kluwer Health/Lippincott Williams & Wilkins.
Chicago Style (17th ed.) Zitazioa
Speroff, Leon, eta Philip D. Darney. A Clinical Guide for Contraception. Fifth edition. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins, 2011.
MLA (9th ed.) Zitazioa
Speroff, Leon, eta Philip D. Darney. A Clinical Guide for Contraception. Fifth edition. Wolters Kluwer Health/Lippincott Williams & Wilkins, 2011.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.