Yajai Chuwicha. (1986) Cohesion in Thai. Mahidol University,:ม.ป.ท.Yajai Chuwicha. 1986. Cohesion in Thai. ม.ป.ท.:Mahidol University,;Yajai Chuwicha. Cohesion in Thai. ม.ป.ท.:Mahidol University, 1986. Print.