Rachjikorn Jitwattananon. (2021) Competency Development of Educational Personnel Office Secondary schools in the lower central region. <i>Journal of Management Science Nakhon Pathom Rajabhat University</i>, <i>8</i>(1), 63-78.Rachjikorn Jitwattananon. "Competency Development of Educational Personnel Office Secondary schools in the lower central region". Journal of Management Science Nakhon Pathom Rajabhat University 8 (2021):63-78.Rachjikorn Jitwattananon. Competency Development of Educational Personnel Office Secondary schools in the lower central region. Faculty of Management Science Nakhon Pathom Rajabhat University.:ม.ป.ท. 2021.