Private, non-profit, and plantation: Oil palm smallholders in management-assistance programs vary in socio-demographics, attitudes, and management practices by Reiss-Woolever, VJ, Wakhid, W, Ikhsan, M, Caliman, J, Naim, M, Azmi, EN, Shufiyan, S, Howes, J, Azmi, R, Ying Lim, Y, Abdul Jan, SZ, Barrock, I, Azhar, B, Drewer, J, Ward, C, Jones, JA, Luke, SH, Turner, EC, Hidayat, P, Buchori, D