1961
Eric Salzman. "Percussion Group in Concert Here; Composers Unit is Host to Manhattan Ensemble.” The New York Times (November 22, 1961)

https://www.nytimes.com/1961/11/22/archives/percussion-group-in-concert-here-composers-unit-is-host-to.html

Megan Murph, “Max Neuhaus and the Avant-Garde” (Master’s Thesis, Louisiana State University, 2013).