Lawan Boonyamanond. (1999) Effects of cigarette smoking on severity of periodontal disease among male taxi motor-cyclists in Thung Kru district, Bangkok. Mahidol University,:ม.ป.ท.Lawan Boonyamanond. 1999. Effects of cigarette smoking on severity of periodontal disease among male taxi motor-cyclists in Thung Kru district, Bangkok. ม.ป.ท.:Mahidol University,;Lawan Boonyamanond. Effects of cigarette smoking on severity of periodontal disease among male taxi motor-cyclists in Thung Kru district, Bangkok. ม.ป.ท.:Mahidol University, 1999. Print.