Asawadejmetakul, Puntwitt, Weerachat Premananda, and Duangjai Thewtong. 2025. “Doctoral Creative Research on Innovation Vocal Method by Puntwitt”. Rangsit Music Journal 20 (2):R0204 (18 pages). https://doi.org/10.59796/rmj.V20N2.2025.R0204.