Nguon Siek และ Nuntarat Charoenkul. (2014) A STUDY OF THE COMPETENCY OF SECONDARY SCHOOL DIRECTORS UNDER THE JURISDICTION OF PHNOM PENH MUNICIPAL DEPARTMENT OF EDUCATION, YOUTH AND SPORT, THE KINGDOM OF CAMBODIA. Chulalongkorn University:ม.ป.ท.Nguon Siek และ Nuntarat Charoenkul. 2014. A STUDY OF THE COMPETENCY OF SECONDARY SCHOOL DIRECTORS UNDER THE JURISDICTION OF PHNOM PENH MUNICIPAL DEPARTMENT OF EDUCATION, YOUTH AND SPORT, THE KINGDOM OF CAMBODIA. ม.ป.ท.:Chulalongkorn University;Nguon Siek และ Nuntarat Charoenkul. A STUDY OF THE COMPETENCY OF SECONDARY SCHOOL DIRECTORS UNDER THE JURISDICTION OF PHNOM PENH MUNICIPAL DEPARTMENT OF EDUCATION, YOUTH AND SPORT, THE KINGDOM OF CAMBODIA. ม.ป.ท.:Chulalongkorn University, 2014. Print.