Menkiti, I. A. "Physical and Metaphysical Understanding: Nature, Agency, and Causation in African Traditional Thought." African Philosophy: New and Traditional Perspectives. : Oxford University Press, 2004-02-12. Oxford Scholarship Online. 2006-02-01. Date Accessed 26 May. 2013 <http://www.oxfordscholarship.com/view/10.1093/019511440X.001.0001/acprof-9780195114409-chapter-7>.
Menkiti, I.(2004-02-12). Physical and Metaphysical Understanding: Nature, Agency, and Causation in African Traditional Thought. In African Philosophy: New and Traditional Perspectives. : Oxford University Press. Retrieved 26 May. 2013, from http://www.oxfordscholarship.com/view/10.1093/019511440X.001.0001/acprof-9780195114409-chapter-7.
Menkiti, I. A. "Physical and Metaphysical Understanding: Nature, Agency, and Causation in African Traditional Thought." In African Philosophy: New and Traditional Perspectives. : Oxford University Press, 2004-02-12. http://www.oxfordscholarship.com/view/10.1093/019511440X.001.0001/acprof-9780195114409-chapter-7.
Menkiti IA. Physical and Metaphysical Understanding: Nature, Agency, and Causation in African Traditional Thought. In: Brown LM. African Philosophy: New and Traditional Perspectives. Oxford University Press; 2004. http://www.oxfordscholarship.com/view/10.1093/019511440X.001.0001/acprof-9780195114409-chapter-7. Accessed May 26, 2013.