boonyanuphong, P., and N. Chuaysakul. “Factors Determining Farmer’s Decision on Area Expansion of Oil Palm Plantation in Pak Phanang Basin Area, Nakhon Si Thammarat province”. The Journal of Integrated Business Innovation and Sustainability (JIBIS), vol. 9, no. 2, Nov. 2019, pp. 81-100, https://so02.tci-thaijo.org/index.php/fam/article/view/223408.