S. M.S, N. Lyndon, R. A. Che Rose, S. Selvadurai, and R. Ramly, “Peranan Koperasi Dalam Meningkatkan Pendapatan Pekebun Kecil: Kajian Kes Koperasi Penanaman Sawit Mampan (KPSM): The Role of Cooperatives in Increasing Smallholder’s Income: Case Study on Sustainable Palm Oil Cooperative (KPSM)”, GEOG, vol. 5, no. 3, pp. 64–71, Dec. 2017.