Gaya APA

Gabbe, S, G, J, R, N, J, L, S. (2007). Obstetrics : Normal and Problem Pregnancies . Philadelphia: Elsevier Inc..

Gaya MLA

Gabbe, Steven, G.,, Jennifer, R., Niebyl,, Joe, Leigh, Simpson. "Obstetrics : Normal and Problem Pregnancies". Philadelphia: Elsevier Inc., 2007. E-Book.