APA Style
BILLINGS, Evelyn L. (2007).
Metode Ovulasi Billings (Ed. 2).
Yogyakarta:
Kanisius.
Chicago Style
BILLINGS, Evelyn L.
Metode Ovulasi Billings.
Ed. 2
Yogyakarta:
Kanisius,
2007.
Text.
MLA Style
BILLINGS, Evelyn L.
Metode Ovulasi Billings.
Ed. 2
Yogyakarta:
Kanisius,
2007.
Text.
Turabian Style
BILLINGS, Evelyn L.
Metode Ovulasi Billings.
Ed. 2
Yogyakarta:
Kanisius,
2007.
Print.