M. Boney, A. Azwan, R. Haya, and M. M. Dandan, “Effects of Organic and Inorganic Fertilizers on Soil Chemical Properties and the Production of Cocoa (Theobroma cacao L.) in Madai, Kunak, Sabah”, JBAU, vol. 18, no. S1, pp. 811–815, Nov. 2020.