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Rich, J. (2020, March 31). Ping, Jean. Oxford Research Encyclopedia of African History. Retrieved 6 Mar. 2021, from https://oxfordre.com/africanhistory/view/10.1093/acrefore/9780190277734.001.0001/acrefore-9780190277734-e-800.
Rich, Jeremy. "Ping, Jean." Oxford Research Encyclopedia of African History. March 31, 2020. Oxford University Press. Date of access 6 Mar. 2021, <https://oxfordre.com/africanhistory/view/10.1093/acrefore/9780190277734.001.0001/acrefore-9780190277734-e-800>
Rich, Jeremy. "Ping, Jean." Oxford Research Encyclopedia of African History. 31 Mar. 2020; Accessed 6 Mar. 2021. https://oxfordre.com/africanhistory/view/10.1093/acrefore/9780190277734.001.0001/acrefore-9780190277734-e-800.