APA Style
Billings, E., Westmore, A.
(2007).
Metode Ovulasi Billing. Cara Mengatur Kesuburan
(
cet. 2)
.
Jakarta:
KPG.
MLA Style
Billings, Evelyn., Westmore, Ann.
"Metode Ovulasi Billing. Cara Mengatur Kesuburan".
cet. 2
Jakarta:
KPG,
2007.
Text.