Gaya APA

cunningham, ., cunningham, F, G. (1993). Williams Obstetrics 19th Edition Buku 1 . New York: Prentice Hall.

Gaya MLA

cunningham, ., cunningham, F., Garry. "Williams Obstetrics 19th Edition Buku 1". New York: Prentice Hall, 1993. Text.