Billings ovulation method (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Billings ovulation method" in English language version.

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Hatcher, Robert Anthony; M.D, Anita L. Nelson (2007). Contraceptive Technology. Ardent Media. p. 345. ISBN 9781597080019.
Poston, Dudley L. Jr.; Bouvier, Leon F. (2010). Population and Society: An Introduction to Demography. Cambridge University Press. p. 91. ISBN 9781139489386.

China Successfully Launching Billings Method Archived December 30, 2006, at the Wayback Machine: Dr. Shao-Zhen Qian
Odeblad, Erik (1994). "The Discovery of Different Types of Cervical Mucus". Bulletin of the Ovulation Method Research and Reference Centre of Australia. 21 (3): 3–35. Archived from the original on 2005-12-20. Retrieved 2006-10-19.
Billings, J (2002). "THE QUEST - leading to the discovery of the Billings Ovulation Method". Bulletin of Ovulation Method Research and Reference Centre of Australia. 29 (1): 18–28. Archived from the original on 2007-02-19.

China Successfully Launching Billings Method Archived December 30, 2006, at the Wayback Machine: Dr. Shao-Zhen Qian
Odeblad, Erik (1994). "The Discovery of Different Types of Cervical Mucus". Bulletin of the Ovulation Method Research and Reference Centre of Australia. 21 (3): 3–35. Archived from the original on 2005-12-20. Retrieved 2006-10-19.

Billings, J (2002). "THE QUEST - leading to the discovery of the Billings Ovulation Method". Bulletin of Ovulation Method Research and Reference Centre of Australia. 29 (1): 18–28. Archived from the original on 2007-02-19.