Silalahi และ Maria. (1999) Assessment of community health volunteers in dental care activities in Paktongchai district Nakornrajchasima Thailand. Mahidol University,:ม.ป.ท.Silalahi และ Maria. 1999. Assessment of community health volunteers in dental care activities in Paktongchai district Nakornrajchasima Thailand. ม.ป.ท.:Mahidol University,;Silalahi และ Maria. Assessment of community health volunteers in dental care activities in Paktongchai district Nakornrajchasima Thailand. ม.ป.ท.:Mahidol University, 1999. Print.