Pathratipa Sansayavichai. (1995) Thai kaolin : appropriate technological development for pharmaceutical purposes. Mahidol University,:ม.ป.ท.Pathratipa Sansayavichai. 1995. Thai kaolin : appropriate technological development for pharmaceutical purposes. ม.ป.ท.:Mahidol University,;Pathratipa Sansayavichai. Thai kaolin : appropriate technological development for pharmaceutical purposes. ม.ป.ท.:Mahidol University, 1995. Print.