Gaya APA

Gray, J, -, S, R. et al (2010). Esensial Kebidanan (Midwifery Essentials) . Jakarta: EGC.

Gaya MLA

Gray, Joanne, -, Smith,, Rachel. et al. "Esensial Kebidanan (Midwifery Essentials)". Jakarta: EGC, 2010. Textbook.