Yothsanai Kruangtip. (2000) Factors related to vision of the head of health centers in Public Health region 4. Mahidol University,:ม.ป.ท.Yothsanai Kruangtip. 2000. Factors related to vision of the head of health centers in Public Health region 4. ม.ป.ท.:Mahidol University,;Yothsanai Kruangtip. Factors related to vision of the head of health centers in Public Health region 4. ม.ป.ท.:Mahidol University, 2000. Print.