Preedaporn Srisakorn. (1987) The sound system of Khmu at Nampan in Nan. Mahidol University,:ม.ป.ท.Preedaporn Srisakorn. 1987. The sound system of Khmu at Nampan in Nan. ม.ป.ท.:Mahidol University,;Preedaporn Srisakorn. The sound system of Khmu at Nampan in Nan. ม.ป.ท.:Mahidol University, 1987. Print.