Duong และ Phuc Lam. (2005) Smoking behavior and status among medical doctors in Cantho University of Medicine and Pharmacy, Vietnam /. Mahidol University,:ม.ป.ท.Duong และ Phuc Lam. 2005. Smoking behavior and status among medical doctors in Cantho University of Medicine and Pharmacy, Vietnam /. ม.ป.ท.:Mahidol University,;Duong และ Phuc Lam. Smoking behavior and status among medical doctors in Cantho University of Medicine and Pharmacy, Vietnam /. ม.ป.ท.:Mahidol University, 2005. Print.