Marais, J., CJ. van Wyk, and A. Rapp. “Carotenoid Levels in Maturing Grapes As Affected by Climatic Regions, Sunlight and Shade”. South African Journal of Enology and Viticulture 12, no. 2 (May 4, 2017): 64–69. Accessed March 7, 2026. https://www.journals.ac.za/sajev/article/view/2209.