Prapaphon Kham-o-part. (2018) THE MODEL OF TEACHER'S PROFESSIONAL LEARNING COMMUNITY FOR THE NON-FORMAL AND INFORMAL EDUCATIONAL CENTER IN THAILAND'S UPPER NORTHERN REGION. <i>Humanities, Arts and Social Sciences Studies</i>, <i>18</i>(2), 443-462.Prapaphon Kham-o-part. "THE MODEL OF TEACHER'S PROFESSIONAL LEARNING COMMUNITY FOR THE NON-FORMAL AND INFORMAL EDUCATIONAL CENTER IN THAILAND'S UPPER NORTHERN REGION". Humanities, Arts and Social Sciences Studies 18 (2018):443-462.Prapaphon Kham-o-part. THE MODEL OF TEACHER'S PROFESSIONAL LEARNING COMMUNITY FOR THE NON-FORMAL AND INFORMAL EDUCATIONAL CENTER IN THAILAND'S UPPER NORTHERN REGION. Silpakorn University Research and Development Institute:ม.ป.ท. 2018.