Gaya APA

Cunningham, F, G., Gant, N, F. (2001). Williams Obstetrics International Edition 21 St Edition (ed 21). America: Mcgraw Hill Book Companies.

Gaya MLA

Cunningham, F., Gary., Gant, Norman, F.. "Williams Obstetrics International Edition 21 St Edition". ed 21 America: Mcgraw Hill Book Companies, 2001. Text.