APA Style
BILLINGS, Evelyn. (2006).
Metode Ovulasi Billings (Cet. 1).
Jakarta:
KPG ( Kepustakaan Populer Gramedia ).
Chicago Style
BILLINGS, Evelyn.
Metode Ovulasi Billings.
Cet. 1
Jakarta:
KPG ( Kepustakaan Populer Gramedia ),
2006.
.
MLA Style
BILLINGS, Evelyn.
Metode Ovulasi Billings.
Cet. 1
Jakarta:
KPG ( Kepustakaan Populer Gramedia ),
2006.
.
Turabian Style
BILLINGS, Evelyn.
Metode Ovulasi Billings.
Cet. 1
Jakarta:
KPG ( Kepustakaan Populer Gramedia ),
2006.
.