Gaya APA

Katharin, F, C, N, F, G, K, J, L, L, C, G, I, J, C, H. (2006). Obstetri Williams (Edisi 21). Jakarta: EGC.

Gaya MLA

Katharin, F.Gary, Cunningham,, Norman, F., Gant,, Kenneth, J., Levenop,, Larry, C., Gilstrap, III,, John, C, Hauth,. "Obstetri Williams". Edisi 21 Jakarta: EGC, 2006. Text.