1999
Nyman Michael, Exsperimental Music: Cage and Beyond, 2nd ed.. Cambridge University Press, 1999, p.105 and Book, p.103

(Max Neuhaus Listen installation page 105) from: Max Neuhaus, “A Max Sampler”, Larry Austin (ed), Sources, n° 5, 1969

https://assets.cambridge.org/97805216/53831/frontmatter/9780521653831_frontmatter.pdf