DEVINE, Kyle. A mysterious music in the air: cultural origins of the loudspeaker. Popular Music History, [S. l.], v. 8, n. 1, p. 5–28, 2014. DOI: 10.1558/pomh.v8i1.5. Disponível em: https://journal.equinoxpub.com/PMH/article/view/13372.. Acesso em: 16 jul. 2024.