Yeamkong, suphawadee, Ngoc, T.N., Kotom, P., Jaipong, P., Noinumsai, P., Yaemkong, S. and Seema, P. 2018. The Study on Farmers’ Knowledge and Behavior in Using of Chemicals for Protection and Pest Elimination in Pho Thale Sub-district, Pho Thale District, Phichit Province. Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University. 12, 2 (Jan. 2018), 444–454.