Tashi Norbu และ Usaneya Perngparn. (2011) Drugs and alcohol use by secondary school students in Thimphu, Bhutan. Chulalongkorn University:ม.ป.ท.Tashi Norbu และ Usaneya Perngparn. 2011. Drugs and alcohol use by secondary school students in Thimphu, Bhutan. ม.ป.ท.:Chulalongkorn University;Tashi Norbu และ Usaneya Perngparn. Drugs and alcohol use by secondary school students in Thimphu, Bhutan. ม.ป.ท.:Chulalongkorn University, 2011. Print.