van Averbeke, W, T.E. Tshikalange, and K.A. Juma. “The Commodity Systems of <i>Brassica rapa</i> L. Subsp. Chinensis and <i>Solanum retroflexum</i> Dun. In Vhembe, Limpopo Province, South Africa”. Water SA 33, no. 3 (December 6, 2018): 349–354. Accessed September 28, 2026. https://www.ajol.info/index.php/wsa/article/view/180593.