Somsak Triamjangarun. 1982. An economic study of mineral taxation in Thailand. Bangkok:Thammasat University;
Somsak Triamjangarun. (1982) An economic study of mineral taxation in Thailand (รายงานผลงานวิจัย). Thammasat University:Bangkok.
Somsak Triamjangarun. An economic study of mineral taxation in Thailand. Bangkok:Thammasat University, 1982.
Somsak Triamjangarun. (1982) An economic study of mineral taxation in Thailand (รายงานผลงานวิจัย). Thammasat University:Bangkok.