Jinta, Siriwan, and Piyada Wachirawongsakorn. 2021. “EVALUATION HEAVY METALS CONTAMINATED OF ECONOMIC VEGETABLES: CASE STUDY IN BUENGPHRA SUB-DISTRICT, MUANG DISTRICT, PHITSANULOK”. PSRU Journal of Science and Technology 6 (1). Phitsanulok, Thailand:28-38. https://ph01.tci-thaijo.org/index.php/Scipsru/article/view/243459.