Luu และ Nguyen Thi. (1995) The effects of exposure to the emission of motor vehicles on blood lead levels and pulmonary functions among employees working on the expressways Bangkok Thailand 1994. Mahidol University,:ม.ป.ท.Luu และ Nguyen Thi. 1995. The effects of exposure to the emission of motor vehicles on blood lead levels and pulmonary functions among employees working on the expressways Bangkok Thailand 1994. ม.ป.ท.:Mahidol University,;Luu และ Nguyen Thi. The effects of exposure to the emission of motor vehicles on blood lead levels and pulmonary functions among employees working on the expressways Bangkok Thailand 1994. ม.ป.ท.:Mahidol University, 1995. Print.