199

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

200

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

Mayo Clinic: Basal body temperature for natural family planning.

mayoclinic.org/tests-procedures/basal-body-temperature/basics/what-you-can-expect/prc-20019978.

Назад: 198

Дальше: 202