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Gardner, L.  (2018, July 30). Numerical Data and Statistical Sources. Oxford Research Encyclopedia of African History. Retrieved 20 Jan. 2021, from https://oxfordre.com/africanhistory/view/10.1093/acrefore/9780190277734.001.0001/acrefore-9780190277734-e-366.

Gardner, Leigh. "Numerical Data and Statistical Sources." Oxford Research Encyclopedia of African History.  July 30, 2018. Oxford University Press. Date of access 20 Jan. 2021, <https://oxfordre.com/africanhistory/view/10.1093/acrefore/9780190277734.001.0001/acrefore-9780190277734-e-366>

Gardner, Leigh. "Numerical Data and Statistical Sources." Oxford Research Encyclopedia of African History. 30 Jul. 2018; Accessed 20 Jan. 2021. https://oxfordre.com/africanhistory/view/10.1093/acrefore/9780190277734.001.0001/acrefore-9780190277734-e-366.