Duangwichian, C., S. . Pumpuang, K. Sudakaew, A. . Wangsang, . W. . Mudmod, C. C. Chukorn, and J. . Gatewong. “Yield Trial of Oil Palm Varieties in Pathum Thani Province”. Thai Agricultural Research Journal, vol. 32, no. 1, Jan. 2014, pp. 45-57, doi:10.14456/thaidoa-agres.2014.23.