ORREGO MONTES, C. Extensión Musical Educativa. Revista Musical Chilena, [S. l.], v. 11, n. 56, p. p. 61–62, 1957. Disponível em: https://rchdt.uchile.cl/index.php/RMCH/article/view/12482. Acesso em: 6 may. 2024.