Somboonsuke, Buncha, Paratta Prommee, Parinya Cherdchom, and Jaruiy Petcharat. 2003. “The Sustainable Livelihood of Rubber Small Holder: A Case Study of Rubber- Fruit Tree Farming System in Kao Phra Community, The Southern Thailand”. Kasetsart Journal of Social Sciences 24 (2):156-68. https://so04.tci-thaijo.org/index.php/kjss/article/view/243383.