Pearce, D. G., Swart, J., Lewis-Williams, J. D. and Lombard, M. (2021) “The Harris Matrix and rock art; explanation and the Howieson’s Poort”, Southern African Humanities, 18(2), pp. 173–88. Available at: https://sahumanities.org/index.php/sah/article/view/252 (Accessed: 9March2021).