Dungtripop, Wilawan, and Pankeawta Lakkanawanit. 2018. “A Comparative Study on Costs and Returns of Native and Recommended Rice Productions in Pak Panang Basin”. Area Based Development Research Journal 10 (5). Nakhon Si Thammarat, Thailand:375-91. https://so01.tci-thaijo.org/index.php/abcjournal/article/view/153182.