Harris, Christopher, Robert W. Gess, Cameron Penn-Clarke, and Bruce S. Rubidge. “Coombs Hill: A Late Devonian Fossil Locality in the Witpoort Formation (Witteberg Group, South Africa)”. South African Journal of Science 117, no. 3/4 (March 29, 2021). Accessed May 2, 2024. https://sajs.co.za/article/view/9190.