Pitkin, R. M., & Zlatnik, F. J. (1981). The year book of obstetrics and gynecology. Year Book Medical.
Cita Chicago (17th ed.)Pitkin, Roy M., i Frank J. Zlatnik. The Year Book of Obstetrics and Gynecology. Year Book Medical, 1981.
Cita MLA (9th ed.)Pitkin, Roy M., i Frank J. Zlatnik. The Year Book of Obstetrics and Gynecology. Year Book Medical, 1981.
Atenció: Aquestes cites poden no estar 100% correctes.