Gaya APA

Cunninghsm,MD, F. (2001). Williams Obstetrics Jilid 1 (21). : The McGraw-hill Cmpanies.

Gaya MLA

Cunninghsm,MD, F.Gary. "Williams Obstetrics Jilid 1". 21 : The McGraw-hill Cmpanies, 2001. Text.