Cita APA (7th ed.)

OBSTETRICS AND GYNECOLOGY.., LING, F. W. [., & DUFF, P. [. (2001). Obstetrics and gynecology: Principles for practices. McGraw-Hill.

Cita Chicago (17th ed.)

OBSTETRICS AND GYNECOLOGY.., Frank W. [ed] LING, i Patrick [ed] DUFF. Obstetrics and Gynecology: Principles for Practices. New York: McGraw-Hill, 2001.

Cita MLA (9th ed.)

OBSTETRICS AND GYNECOLOGY.., et al. Obstetrics and Gynecology: Principles for Practices. McGraw-Hill, 2001.