“Influence of Applied Copper and Other Micronutrients on Groundnuts (Arachis Hypogaea) and Sorghum (Sorghum Bicolour) on Malaysian Oligotrophic Peat”. Tropical Agriculture 56, no. 1 (January 30, 1979). Accessed April 23, 2025. https://journals.sta.uwi.edu/ojs/index.php/ta/article/view/2921.