Andrew, L. Sweeney.  (2560).  using task-based learning approach and drama to improve communicative competence for students at pibulsongkram rajabhat university. ????????????????????????????. ????????????????????????????, ????????.

Amnuay, R. .  (2557).  A study of the Problem and Mission of Volunteer Health the Territory : a Case study in the Phichit Province. ????????????????????????????, ????????. Retrieved from http://etheses.psru.ac.th/lib-irpsru/?q=th/node/961