Apiradee Sriopas. (1999) A devised appliance for toluene detector tube as a direct reading instrument. Mahidol University,:ม.ป.ท.Apiradee Sriopas. 1999. A devised appliance for toluene detector tube as a direct reading instrument. ม.ป.ท.:Mahidol University,;Apiradee Sriopas. A devised appliance for toluene detector tube as a direct reading instrument. ม.ป.ท.:Mahidol University, 1999. Print.