Gaya APA

Cunningham, F, G. (2014). Williams Obstetrics, 24th edition (24 th. Edition). USA: Mc Graw-Hill.

Gaya MLA

Cunningham, F., Gary...[et.al]. "Williams Obstetrics, 24th edition". 24 th. Edition USA: Mc Graw-Hill, 2014. Text.