Woottipong Satayavongthip. (1995) Factors affecting drug cost in big health centers Nakorn Ratchasima province. Mahidol University,:ม.ป.ท.Woottipong Satayavongthip. 1995. Factors affecting drug cost in big health centers Nakorn Ratchasima province. ม.ป.ท.:Mahidol University,;Woottipong Satayavongthip. Factors affecting drug cost in big health centers Nakorn Ratchasima province. ม.ป.ท.:Mahidol University, 1995. Print.