Devkota และ Uma Nath. (1992) A hospital based case-control study on risk factors for lung cancer among Thai males. Mahidol University,:ม.ป.ท.Devkota และ Uma Nath. 1992. A hospital based case-control study on risk factors for lung cancer among Thai males. ม.ป.ท.:Mahidol University,;Devkota และ Uma Nath. A hospital based case-control study on risk factors for lung cancer among Thai males. ม.ป.ท.:Mahidol University, 1992. Print.