Ofori-Frimpong, K, GK Asamoah, and MR Appiah. “Distribution of Free and Total Aluminium in Some Cocoa-Growing Soils of Ghana”. Ghana Journal of Agricultural Science 32, no. 1 (January 1, 1999): 101–108. Accessed August 30, 2026. https://www.ajol.info/index.php/gjas/article/view/1920.