“Contraceptive Failure Rate in the U.S.: Revised Estimates From the 1982 Natl. Survey of Family Growth,” E.F. Jones and J.D. Forrest, Family Planning Perspectives, May/June 1989, p. 103.
“Contraceptive Failure Rate in the U.S.: Revised Estimates From the 1982 Natl. Survey of Family Growth,” E.F. Jones and J.D. Forrest, Family Planning Perspectives, May/June 1989, p. 103.
「美国的避孕失败率：根据1982年全国家庭增长调查所作的修订估计」，琼斯及福利司特，《家庭计划透视》，1989年5/6月，第103页。