Apitsara Noiburee อ. น.; Jularat Wattana จ. ว.; ตัณฑวุฑโฒ ว. The Learning Activity Based - on Khit Pen Concept to Enhance Classroom Research Knowledge for Teachers of Bang Khen District Non-Formal and Informal Education Center under Bangkok Office of the Non-Formal and Informal Education. Journaldtc 2018, 12, 277-290.