Artdet, Wanpiti, Chamaree Klangkarn, Udomsak Kitthawee, Phanomporn Poldaeng, and Sirorad Sribanchaem. 2017. “Reduction of production factors in pesticide - free vegetables for farmers in Wangyao, Danchang district, Supanburi province”. Asia-Pacific Journal of Science and Technology 16 (8):942-50. https://so01.tci-thaijo.org/index.php/APST/article/view/83616.