De Prada-Samper, J. M., and J. C. Hollmann. “‘From the Lips of the Bushmen’: Unpublished |xam San Comments on Stow’s South African Rock Art Copies”. Southern African Humanities, vol. 30, Oct. 2017, pp. 1-34, https://sahumanities.org/index.php/sah/article/view/418.