ISBN 978-0-19-503996-2. 含有內容需登入查看的頁面 (link) Kraemer, Sebastian. The Origins ofFatherhood: An Ancient Family Process. Family Process. 1991, 30 (4): 377–392. PMID 1790784
(PDF)于2016-08-23). Fertility, Contraception, and Fatherhood: Data on Men and Women From Cycle 6 (2002) of the National Survey of Family Growth (PDF). Centers for Disease