Davidova, Jelena, Galina Zavadska, Asta Rauduvaitė, and Ming-Jen Chuang. “Strategies for Developing 6–8 Year-Old Children’s Singing Intonation”. Pedagogika 128, no. 4 (December 20, 2017): 206-216. Accessed April 6, 2020. https://ejournals.vdu.lt/index.php/Pedagogika/article/view/565.