BULL, Michael. Williams, Andrew. 2007. ’Portable Music and its Functions’. New York: Peter Lang. ISBN 978-0-8204-8125-8 (pbk). 127 pp. Perfect Beat, [S. l.], v. 10, n. 2, p. 223–224, 2009. DOI: 10.1558/prbt.v10i2.223. Disponível em: https://journal.equinoxpub.com/PB/article/view/16557. Acesso em: 21 dec. 2024.