Doke,Clement M.; Dart,Raymond A.; Goodwin,A.J.H.; Marais,J.S.; Eiselen,W.M. (1962). The Bantu Speaking Tribes Of South Africa. Routledge And Kegan Paul Limited. pp. 333–334.
O'Keeffe, J. H.; De Moor, F. C. (January 1988). "Changes in the physico-chemistry and benthic invertebrates of the great fish river, South Africa, following an interbasin transfer of water". Regulated Rivers: Research & Management. 2 (1): 39–55. doi:10.1002/rrr.3450020105. ISSN0886-9375.
O'Keeffe, J. H.; De Moor, F. C. (January 1988). "Changes in the physico-chemistry and benthic invertebrates of the great fish river, South Africa, following an interbasin transfer of water". Regulated Rivers: Research & Management. 2 (1): 39–55. doi:10.1002/rrr.3450020105. ISSN0886-9375.