Gaya APA

[et.al], F, G, C. et al (2012). Obstetri williams Vol.1 (Ed.23). Jakarta: EGC.

Gaya MLA

[et.al], F., Gary, Cunningham. et al. "Obstetri williams Vol.1". Ed.23 Jakarta: EGC, 2012. Kesehatan Masyarakat.