Somsak Fongsupa. (1999) Biological indicator for toluene exposure. Mahidol University,:ม.ป.ท.Somsak Fongsupa. 1999. Biological indicator for toluene exposure. ม.ป.ท.:Mahidol University,;Somsak Fongsupa. Biological indicator for toluene exposure. ม.ป.ท.:Mahidol University, 1999. Print.