1. "Natural family planning": effective birth control supported by the Catholic church;Ryder, R.E.J.;BMJ,1993
2. The Humanae Vitae crisis;Brown, P.D.;The Tablet,1993
3. Physiology of human female sexual response;Riley, A.J.; Trimmer, E.,1991
4. Monthly rhythm of libido in married women;Hart, R.D.;BMJ,1960
5. Effectiveness of contraceptive methods;Tietze, C.,1971