Gaya APA
Cunnngham, G, F, E.
(2006).
Obstetri williams vol. 1 edisi 21
.
Jakarta:
EGC.
Gaya MLA
Cunnngham, Gary, F, Et.all.
"Obstetri williams vol. 1 edisi 21".
Jakarta:
EGC,
2006.
PRINTED BOOK.