Kittiphod Charoontham และ Thunyarat Amornpetchkul. (2017) Investigation of credit rating agency payment scheme to improve profit abilityand rating quality. National Institute of Development:ม.ป.ท.Kittiphod Charoontham และ Thunyarat Amornpetchkul. 2017. Investigation of credit rating agency payment scheme to improve profit abilityand rating quality. ม.ป.ท.:National Institute of Development;Kittiphod Charoontham และ Thunyarat Amornpetchkul. Investigation of credit rating agency payment scheme to improve profit abilityand rating quality. ม.ป.ท.:National Institute of Development, 2017. Print.