Chupensri Wongbuddha. (1988) A study of changes in urbanization and occupational mobility of the Thai labour force. National Institute of Development Administration,:ม.ป.ท.Chupensri Wongbuddha. 1988. A study of changes in urbanization and occupational mobility of the Thai labour force. ม.ป.ท.:National Institute of Development Administration,;Chupensri Wongbuddha. A study of changes in urbanization and occupational mobility of the Thai labour force. ม.ป.ท.:National Institute of Development Administration, 1988. Print.