Paithoon Thuamkorn. 2009. Characteristics and teaching techniques of tutors in tutorial schools. Bangkok:Thammasat University; DOI : https://doi.nrct.go.th/ListDoi/listDetail?Resolve_DOI=10.14457/TU.res.2009.16
Paithoon Thuamkorn. (2009) Characteristics and teaching techniques of tutors in tutorial schools (รายงานผลงานวิจัย). Thammasat University:Bangkok. DOI : https://doi.nrct.go.th/ListDoi/listDetail?Resolve_DOI=10.14457/TU.res.2009.16
Paithoon Thuamkorn. Characteristics and teaching techniques of tutors in tutorial schools. Bangkok:Thammasat University, 2009. DOI : https://doi.nrct.go.th/ListDoi/listDetail?Resolve_DOI=10.14457/TU.res.2009.16
Paithoon Thuamkorn. (2009) Characteristics and teaching techniques of tutors in tutorial schools (รายงานผลงานวิจัย). Thammasat University:Bangkok. DOI : https://doi.nrct.go.th/ListDoi/listDetail?Resolve_DOI=10.14457/TU.res.2009.16