Gaya APA

Cunningham, F, G., Sidharta, B, A. (2012). Obstetri Williams vol. 1 (23). -: EGC..

Gaya MLA

Cunningham, F., Gary., Sidharta, B., Arief. "Obstetri Williams vol. 1". 23 -: EGC., 2012. Kedokteran.