HAOYAN, Zhai; SIMEON, Jinky Jane C. Seeing the Voice: Spectrogram Based Visual Feedback in Teaching Mongolian Long Song in Higher Education. International Journal of Academic Research in Progressive Education and Development, [S. l.], v. 14, n. 4, p. 2084–2096, 2025. Disponível em: https://ijarped.com/index.php/journal/article/view/4011. Acesso em: 4 feb. 2026.