Книга: Обои-убийцы, ядовитая вода и стул-обольститель. Как выжить в собственной квартире
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National Health Service: Planning your pregnancy. nhs.uk/conditions/pregnancy-and-baby/pages/planning-pregnancy.aspx.

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National Health Service: Can I get pregnant if I have sex without penetration? nhs.uk/chq/Pages/975.aspx?CategoryID=54&SubCategoryID=128.

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The Naked Scientists: How fast do sperm swim and how do they find the egg? thenakedscientists.com/HTML/questions/question/2472.

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Humanae Vitae. w2.vatican.va/content/paul-vi/en/encyclicals/documents/hf_p-vi_enc_25071968_humanae-vitae.html.

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Mayo Clinic: Basal body temperature for natural family planning. 
mayoclinic.org/tests-procedures/basal-body-temperature/basics/what-you-can-expect/prc-20019978.
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