Natural Family Planning generally

Frank-Herrmann, Petra:
Family Planning – individual, global and ethical aspects. 2000 IEEF/EIFLE Conference „Natural family planning: future role and developments“ in cooperation with CAMEN and with the contribution of the University of Milan, 28th June-2nd July 2000, in: Abstracts, p. 47.

Freundl, Günter; Sivin, Irving; Batár, István.:
State-of-the-art of non-hormonal mthods of contraception: IV. Natural family planning, in: The European Journal of Contraception and Reproductiv Health Care, April 2010, 15:113-123

Freundl, Günter:
Natural methods of Family Planning. Fertility Control – Update and Trends. T. Rabe, B. Runnebaum (Hrsg.), Springer Verlag, Berlin/Heidelberg/New York 1999.

Freundl, Günter:
Present stage of knowledge of reproductive biology concerning natural family planning, in: GENIUS (1998), Vol. LIV, n. 3-4, p. 57-74.

Sottong, Ursula:
NFP in Europe. Vortrag zur Guangzhou Conference, Kanton, China, 26.06.2005.

Sottong, Ursula; Klann-Heinen, Petra:
NFP Online Counselling. Fertility and Family life in a changing world, anthropological and medical aspects. 2004 European Conference 24-26 June 2004, VMU Kaunas, in: Kongressbericht Kaunas 2004, S. 12.