Aleksandrovna Martynova, Yulia, Dmitry Yevgenyevich Martynov, Alina Mikhailovna Sukhova, y Leila Aivazovna Nurgalieva. «Vocal Education in Kazan: From Amateur Music Playing to Professional Training». Propósitos y Representaciones 9, no. SPE2 (marzo 2, 2021): e1075. Accedido mayo 5, 2024. https://revistas.usil.edu.pe/index.php/pyr/article/view/1075.