ASZTALOS, Andrea. “DEVELOPMENT OF CHILDREN’S SINGING VOICE”. Studia Universitatis Babeş-Bolyai Musica 66, no. 1 (June 30, 2021): 39–54. Accessed April 4, 2025. https://studia.reviste.ubbcluj.ro/index.php/subbmusica/article/view/311.