Department of agriculture. Sales training supervisor of hazardous materials in agriculture, the second generation. [Online]. The sources http: / /www.doa.go.th / Th / index.php? Option = com_jotloader & view = categories & CID = 5_1a7d8b0e0b2231cf0906186497950853 & Itemid = 80. (13 February 2558).
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