Gaya APA

Hellman, L, M., Pritchard, J, A. (1996). Obstetrics William (Ed.4) (4). USA: Meredith Corpoation.

Gaya MLA

Hellman, Louis, M., Pritchard, Jack, A. "Obstetrics William (Ed.4)". 4 USA: Meredith Corpoation, 1996. Text.