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33. Там же,1–31.

34. Там же, 13.

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38. Там же, 1–17.

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45. Odeblad, Erik. “The discovery of different types of cervical mucus and the Billings Ovulation Method.” Bulletin of the Natural Family Planning Council of Victoria 21, no. 3 (1994): 8.

46. Там же, 13; Odeblad, E. “Investigation on the physiological basis for fertility awareness method.” Bulletin of the Ovulation Method Research and Reference Centre of Australia 29, no. 1 (2002): 6.

47. Hilgers, Thomas W. (2004). Reproductive Anatomy & Physiology: A Primer for FertilityCare Professionals, 2nd edition. Omaha, NE: Pope Paul