Kannika Chearjaraswongse และ Kittichok.Nithisathian. (2017) “Tam-Gin-Eang” organic farm at Chiang Rai. Stamford International University:ม.ป.ท.Kannika Chearjaraswongse และ Kittichok.Nithisathian. 2017. “Tam-Gin-Eang” organic farm at Chiang Rai. ม.ป.ท.:Stamford International University;Kannika Chearjaraswongse และ Kittichok.Nithisathian. “Tam-Gin-Eang” organic farm at Chiang Rai. ม.ป.ท.:Stamford International University, 2017. Print.