References
- Hatcher , Robert A. 1978 . Contraceptive Technology 1978–1979, , 9th ed. , 85 New York : Irvington Publishers .
- Bernstein , Gerald S. 1974 . “Conventional Methods of Contraception: Condom, Diaphragm, and Vaginal Foam” . Clinical Obstetrics and Gynecology , 17 March : 1
- _____ . 1974 . “Conventional Methods of Contraception: Condom, Diaphragm, and Vaginal Foam” . Clinical Obstetricsmand Gynecol‐ogy , 17 March : 23
- _____ . 1974 . “Conventional Methods of Contraception: Condom, Diaphragm, and Vaginal Foam” . Clinical Obstetrics and Gyneco‐logy , 17 March : 22
- Free , Michael J. and Alexander , Nancy . 1976 . “Male Contraception without Prescription” . Public Health Reports , 91 (5) September‐October : 438
- _____ and _____ . 1976 . “Male Contraception without Prescription” . Public Health Reports , 91 (5) September‐October : 441
- Hatcher , Robert A. 1978 . Contraceptive Technology 1978–1979, , 9th ed. , 86 – 87 . Irvington Publishers .
- Bernstein , Gerald S. 1974 . “Conventional Methods of Contraception: Condom, Diaphragm, and Vaginal Foam” . Clinical Obstetrics and Gynecology , 17 March : 28
- Hatcher , Robert A . 1978 . Contraceptive Technology 1978–1979, , 9th ed. , 90 Irvington Publishers .