References
- National Center for Health Statistics: Contraceptive Utilization Among Currently Married Women 15–44 Years of Age: United States, 1973. Monthly Vital Statistics Report 25 (Suppl to No. 7), Oct 4, 1976
- Calderone MS: Manual of Contraceptive Practice. Baltimore, The Williams & Wilkins Co, 1964, p 151
- Kahn HS: A new medical record for family planning. Read before the annual meeting, American Public Health Association, San Francisco, Nov 1973
- Mann JI, Vessey MP, Thorogood M, et al: Myocardial infarction in young women with special reference to oral contraceptive practice. Br Med J 2: 241, 1975