TILBURY, J. Composer for Socialism: Betz on Eisler. Contact: A Journal for Contemporary Music (1971-1990), [S. l.], n. 25, 1982. DOI: 10.25602/GOLD.cj.v0i25.1215. Disponível em: https://bjmh.gold.ac.uk/index.php/contactjournal/article/view/contactjournal25_p38-39. Acesso em: 3 jul. 2024.