Moran, V. Cliff, John H. Hoffmann, and Helmuth G. Zimmermann. “100 Years of Biological Control of Invasive Alien Plants in South Africa: History, Practice and Achievements”. South African Journal of Science 109, no. 9/10 (September 18, 2013): 6. Accessed May 6, 2024. https://sajs.co.za/article/view/4016.