Heryandi. (1992) Factors influencing the activeness levels of Village Health Communicators (VHCs) in Nakorn Pathom province. Mahidol University,:ม.ป.ท.Heryandi. 1992. Factors influencing the activeness levels of Village Health Communicators (VHCs) in Nakorn Pathom province. ม.ป.ท.:Mahidol University,;Heryandi. Factors influencing the activeness levels of Village Health Communicators (VHCs) in Nakorn Pathom province. ม.ป.ท.:Mahidol University, 1992. Print.