Jacobs, Nancy (2009). "The Flowing Eye: Water Management in the Upper Kuruman Valley, South Africa, c. 1800–1962". The Journal of African History. 37 (2): 237–260. doi:10.1017/S0021853700035210. ISSN0021-8537. S2CID162353701.
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Irish, E.; Marais, J. (February 2012). "Caves of the Northern Cape, South Africa: a baseline study". Navorsinge van die Nasionale Museum: Researches of the National Museum. 18 (2): 15–29. hdl:10520/AJA00679208_1439.
Jacobs, Nancy (2009). "The Flowing Eye: Water Management in the Upper Kuruman Valley, South Africa, c. 1800–1962". The Journal of African History. 37 (2): 237–260. doi:10.1017/S0021853700035210. ISSN0021-8537. S2CID162353701.
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Jacobs, Nancy (2009). "The Flowing Eye: Water Management in the Upper Kuruman Valley, South Africa, c. 1800–1962". The Journal of African History. 37 (2): 237–260. doi:10.1017/S0021853700035210. ISSN0021-8537. S2CID162353701.