Somsak Puttadong และ Suvaree Wongwattana;Anu Jarernvongrayab. (2022) Confirmatory Factor analysis professional skills of students at the vocational certificate level Automotive Technology Program Technical College under the Institute of Vocational Education Northern Region 4. <i>Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University</i>, <i>16</i>(2), 806 - 819.Somsak Puttadong และ Suvaree Wongwattana;Anu Jarernvongrayab. "Confirmatory Factor analysis professional skills of students at the vocational certificate level Automotive Technology Program Technical College under the Institute of Vocational Education Northern Region 4". Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University 16 (2022):806 - 819.Somsak Puttadong และ Suvaree Wongwattana;Anu Jarernvongrayab. Confirmatory Factor analysis professional skills of students at the vocational certificate level Automotive Technology Program Technical College under the Institute of Vocational Education Northern Region 4. Pibulsongkram Rajabhat University:ม.ป.ท. 2022.