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Upchurch, Dawn M.; Levy-Storms, Lene; Sucoff, Clea A.; Aneshensel, Carol S. (1998). "Gender and Ethnic Differences in the Timing of First Sexual Intercourse". Family Planning Perspectives. 30 (3): 121–127. doi:10.2307/2991625. JSTOR2991625. PMID9635260.
nih.gov
pubmed.ncbi.nlm.nih.gov
Upchurch, Dawn M.; Levy-Storms, Lene; Sucoff, Clea A.; Aneshensel, Carol S. (1998). "Gender and Ethnic Differences in the Timing of First Sexual Intercourse". Family Planning Perspectives. 30 (3): 121–127. doi:10.2307/2991625. JSTOR2991625. PMID9635260.
