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Rumbaugh, D., & Washburn, D.(2003-08-11). Primate Research at the San Diego Zoo. In Intelligence of Apes and Other Rational Beings. : Yale University Press. Retrieved 13 Dec. 2017, from http://yale.universitypressscholarship.com/view/10.12987/yale/9780300099836.001.0001/upso-9780300099836-chapter-7.