Suwannee Piyawong. 2004. Ethical values as appeared in Phnom Rung Inscriptions. Field of Study Ethical Studies, Mahidol University;
Suwannee Piyawong. (2004) Ethical values as appeared in Phnom Rung Inscriptions . Mahidol University/Bangkok.
Suwannee Piyawong. Ethical values as appeared in Phnom Rung Inscriptions. . Bangkok:Mahidol University, 2004.
Suwannee Piyawong. (2004) Ethical values as appeared in Phnom Rung Inscriptions . Mahidol University/Bangkok.