Gaya APA
hacker, .
(2004).
Essentials of obstetrics and gynecology
(
4th.ed.)
.
America:
Elsevier Saunders.
Gaya MLA
hacker, .
"Essentials of obstetrics and gynecology".
4th.ed.
America:
Elsevier Saunders,
2004.
Text.