J. C. Levin, D. J. Woodford, and G. C. Snow, “Evaluating the effectiveness of freshwater fishes as bio-indicators for urban impacts in the Crocodile (West) catchment, South Africa”, WSA, vol. 45, no. 3 July, Jul. 2019, doi: 10.17159/wsa/2019.v45.i3.6745.