Gaya APA

[et.al], F, G, C, �. (2001). Williams obstetrics, 21st ed. (bagian 2) (21). New York: McGraw-Hill.

Gaya MLA

[et.al], F., Gary, Cunningham,, …. "Williams obstetrics, 21st ed. (bagian 2)". 21 New York: McGraw-Hill, 2001. Text.