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* {{REFbook |last=Denniston, |first=GC, & |author-link=George C. Denniston |last2=Hodges, |first2=FM |author2-link=Frederick M. (Hodges |year=1999). |title=Anatomy and histology of the penile and clitoral prepuce in primates. |url= |work= |editor= |edition= |volume= |chapter= |pages= |location= |publisher=Kluwer Academic/Plenum Publishers |isbn= |quote= |accessdate= |note=}}* {{REFbook |last=Martin, |first=RD. ( |year=1990). |title=Primate origins and evolution: a phylogenetic reconstruction. |url= |work= |editor= |edition= |volume= |chapter= |pages= |location=New Jersey: |publisher=Princeton University Press. |isbn= |quote= |accessdate= |note=}}* {{REFbook |last=Butler, |first=AB, & |last2=Hodos, |first2=W. ( |year=1996). |title=Comparative vertebrate neuroanatomy: evolution and adaptation. |url= |work= |editor= |edition= |volume= |chapter= |pages= |location=New York: |publisher=Wiley-Liss. |isbn= |quote= |accessdate= |note=}}