Denpong Wongwichit และผู้แต่งคนอื่นๆ. (2010) Risk reduction of paraquat exposure through risk communication model in maize farmers at Namtok sub-district, Nanoi district, Nan province, Thailand. Chulalongkorn University:ม.ป.ท.Denpong Wongwichit และผู้แต่งคนอื่นๆ. 2010. Risk reduction of paraquat exposure through risk communication model in maize farmers at Namtok sub-district, Nanoi district, Nan province, Thailand. ม.ป.ท.:Chulalongkorn University;Denpong Wongwichit และผู้แต่งคนอื่นๆ. Risk reduction of paraquat exposure through risk communication model in maize farmers at Namtok sub-district, Nanoi district, Nan province, Thailand. ม.ป.ท.:Chulalongkorn University, 2010. Print.