Partnership

Gnoth, Christian; Frank-Herrmann, Petra; Freundl, Günter; Kunert, Josef; Godehardt, Erhard:
Sexual behaviour of natural family planning users in Germany and its changes over time, in: Advances in Contraception (1995), Vol. 11, No. 2, S. 173-185.

Klann, Notker; Hahlweg, Kurt; Bell, M.; Hank, Gerty; Sottong, Ursula:
Caratteristiche psicologiche degli utenti di metodi naturali. Internationaler Kongress der IFFLP vom 09.-11. Dezember 1988 in Mailand, in: Kongressbericht Mailand, S. 89-96.

Klann, Notker; Hahlweg, Kurt; Bell, M.; Sottong, Ursula:
Partnerschaft und NFP-Praxis – Psychologische Aspekte von NFP. VIth World Congress, International Federation for Family Life Promotion, September 26-24, 1994, Lublin/Poland.

Klann, Notker; Hahlweg, Kurt; Hank, Gerty:
Psychological Aspects of NFP Practice, in: International Journal of Fertility, Supplement (1988), p. 65-69.