Gaya APA
Callahan, T, L., Caughey, A, B.
(2013).
Obstetric & Gynecology
(
6)
.
China:
Lippincott Williams and Wilkins.
Gaya MLA
Callahan, Tamara, L.., Caughey, Aaron, B..
"Obstetric & Gynecology".
6
China:
Lippincott Williams and Wilkins,
2013.
Buku.