1. Dunn , H. P. The Rhythm Method of Family Limitation Proc. 4th Asian Cong. Obster. Gynaec 146 150 1968
2. Guy , F. Ile Maurice Xavier Mappus, Lyon 1968
3. Periodic Abstinence in Jewish Law;Lamm;Proc. Internal. Sympos. on Life Rhythm and Abortion,1969
4. A Field Trial of the Basal Body Temperature Method of Regulating Births;Marshall;Lancet,1968