Sheppard, H. L. (1967). Effects of family planning on poverty in the United States. W.E. Upjohn Institute for Employment Research.
Chicago-referens (17:e uppl.)Sheppard, Harold L. Effects of Family Planning on Poverty in the United States. Kalamazoo, Mich: W.E. Upjohn Institute for Employment Research, 1967.
MLA-referens (9:e uppl.)Sheppard, Harold L. Effects of Family Planning on Poverty in the United States. W.E. Upjohn Institute for Employment Research, 1967.
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