Jensamut Saengpun and Anchalee Tananone และ -. (2018) Lesson Study as an Activity System for Mathematics Teachers Professional Development. <i>Journal of Community Development and Life Quality</i>, <i>6</i>(3), 665-687.Jensamut Saengpun and Anchalee Tananone และ -. "Lesson Study as an Activity System for Mathematics Teachers Professional Development". Journal of Community Development and Life Quality 6 (2018):665-687.Jensamut Saengpun and Anchalee Tananone และ -. Lesson Study as an Activity System for Mathematics Teachers Professional Development. Upper northern research administration network:ม.ป.ท. 2018.