“Contraceptive Failure Rate in the U.S.: Estimates From the 1982 Natl. Survey of Family Growth,” M.D. Hayward and J. Yogi, Family Planning Perspectives, Sept/Oct. 1986, p. 204.
“Contraceptive Failure Rate in the U.S.: Estimates From the 1982 Natl. Survey of Family Growth,” M.D. Hayward and J. Yogi, Family Planning Perspectives, Sept/Oct. 1986, p. 204.
「美国的避孕失败率：根据1982年全国家庭增长调查所作的估计」，医学博士海武德及岳奇，《家庭计划透视》，1986年9/10月，第204页。