R. Setianingsih, Z. I. Hanifah, F. D. Widyati, G. A. Wardani, and L. Handayani, “Formation of Regional and National Song Choirs as a Means of Strengthening National Identity for Students of Sanggar Guidance Permai, Pinang Malaysia”, voc, vol. 4, no. 1, pp. 15–21, Apr. 2024.