APA
(1997). Obstetrical and Gynecological Survey. London: Williams and Wilkins.
Chicago
1997. Obstetrical and Gynecological Survey. London: Williams and Wilkins.
Harvard
(1997). Obstetrical and Gynecological Survey. London: Williams and Wilkins.
MLA
Obstetrical and Gynecological Survey. London: Williams and Wilkins. 1997.
