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Cita Chicago (17th ed.)National Research Council (U.S.). Committee on Population, National Research Council (U.S.). Commission on Behavioral and Social Sciences and Education, Workshop on Effects of Welfare on Reproductive Behavior and the Family, John Haaga, i Robert A. Moffitt. Welfare, the Family, and Reproductive Behavior: Report of a Meeting. Washington, DC: National Academy Press, 1998.
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