Nahar และ Begum Shamsun. (1994) Smoking behavior and justification among physicians in Siriraj and Ramathibodi Hospitals Bangkok, Thailand. Mahidol University,:ม.ป.ท.Nahar และ Begum Shamsun. 1994. Smoking behavior and justification among physicians in Siriraj and Ramathibodi Hospitals Bangkok, Thailand. ม.ป.ท.:Mahidol University,;Nahar และ Begum Shamsun. Smoking behavior and justification among physicians in Siriraj and Ramathibodi Hospitals Bangkok, Thailand. ม.ป.ท.:Mahidol University, 1994. Print.