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Anne K. Driscoll, Gesine K. Hearn, V. Jeffery Evans, Kristin A. Moore, Barbara W. Sugland, Vaughn Call, Nonmarital Childbearing among Adult Women, Journal of Marriage and Family, Vol. 61, No. 1 (Feb., 1999), pp. 178-187
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Driscoll et al. (1999) studied this question.
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