Pearce DG, Swart J, Lewis-Williams JD, Lombard M. The Harris Matrix and rock art; explanation and the Howieson’s Poort. SA Humanities [Internet]. 2021 Feb. 5 [cited 2024 May 2];18(2):173-88. Available from: https://www.sahumanities.org/index.php/sah/article/view/252