Pretorius, W., and F. Pretorius. “Konsentrasiekampe Vir Swart Vlugtelinge in Die Heidelbergdistrik Gedurende Die Anglo-Boereoorlog”. Southern Journal for Contemporary History, vol. 36, no. 2, Sept. 2011, pp. 48-69, doi:10.38140/sjch.v36i2.198.