Westmore, D. E. B. d. D. A. Metode Ovulasi billings; cara alami mengatur kesuburan. Jskarta: KGP (kepustakaan populer gramedia), 2006.
Chicago Style (17th ed.) CitationWestmore, Dr. Evelyn Billings dan Dr. Ann. Metode Ovulasi Billings; Cara Alami Mengatur Kesuburan. Jskarta: KGP (kepustakaan populer gramedia), 2006.
MLA (8th ed.) CitationWestmore, Dr. Evelyn Billings dan Dr. Ann. Metode Ovulasi Billings; Cara Alami Mengatur Kesuburan. Jskarta: KGP (kepustakaan populer gramedia), 2006.
Warning: These citations may not always be 100% accurate.