A. Nurafiza, Y. Tee, M. Boney, L. Albert, O. Rozita, and I. Isa, “Carbon, Nitrogen, Phosphorus, and Potassium Content Partitioning of Cocoa Tree Parts in Serian, Sarawak”, PelitaPerkebunan, vol. 33, no. 3, p. 180—187, Dec. 2017.