Nitas Raiyawa. (1988) Factors affecting the achievement of Tambon health center heads regarding the EPI program. Mahidol University,:ม.ป.ท.Nitas Raiyawa. 1988. Factors affecting the achievement of Tambon health center heads regarding the EPI program. ม.ป.ท.:Mahidol University,;Nitas Raiyawa. Factors affecting the achievement of Tambon health center heads regarding the EPI program. ม.ป.ท.:Mahidol University, 1988. Print.