Gaya APA

Cunningham, F, G., Leveno, K, J. (2012). Obstetri Williams Edisi 23 Volume 2 . Jakarta: EGC.

Gaya MLA

Cunningham, F., Gary., Leveno, Kenneth, J.. "Obstetri Williams Edisi 23 Volume 2". Jakarta: EGC, 2012. Text.