POTTER, K. Free Improvisation — A Review. Contact: A Journal for Contemporary Music (1971-1990), [S. l.], n. 21, 1980. DOI: 10.25602/GOLD.cj.v0i21.1151. Disponível em: https://journals.gold.ac.uk/index.php/contactjournal/article/view/contactjournal21_p18-23. Acesso em: 23 may. 2024.