Mathilde Kemp, Kenné N de Kock, Jazelle L Zaayman, and Cornelius T Wolmarans, “A comparison of mollusc diversity between the relatively pristine Marico River and the impacted Crocodile River, two major tributaries of the Limpopo River, South Africa”, WSA, vol. 42, no. 2 April, Apr. 2016, doi: 10.4314/wsa.v42i2.09.