APA citiranje

Billings, E., & Westmore, A. (2007). Metode Ovulasi Billing. Cara Mengatur Kesuburan. KPG.

Chicago Style (17th ed.) Citation

Billings, Evelyn, and Ann Westmore. Metode Ovulasi Billing. Cara Mengatur Kesuburan. KPG, 2007.

MLA citiranje

Billings, Evelyn, and Ann Westmore. Metode Ovulasi Billing. Cara Mengatur Kesuburan. KPG, 2007.

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