APA
(1987). Journal of obstetrics and Gynecology. New York: Elservier.
Chicago
1987. Journal of obstetrics and Gynecology. New York: Elservier.
Harvard
(1987). Journal of obstetrics and Gynecology. New York: Elservier.
MLA
Journal of obstetrics and Gynecology. New York: Elservier. 1987.
