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- Anon. 1961. "B.B.C. Deny Hoax". The Times issue 55148 : 10, col. D. (en)
- Mitchell, Donald. 1961a. "Unbearable Simplicity in Newest Music: Naive Mr. Nono". Daily Telegraph and Morning Post, no. 33,010 : 16. (en)
- Mitchell, Donald. 1961b. "Critics Were Not Deceived: Zak and His 'Mobile'", letter to the editor, Daily Telegraph and Morning Post : 10. (en)
- Ottaway, Hugh. 1967. "Prospect and Perspective". In The Symphony, edited by Robert Simpson, 2:. Middlesex, England: Penguin Books Ltd. . (en)
- Porter, Andrew. 1961. "Editorial". Musical Times 102, no. 1424 : 618. (en)
- Noble, Jeremy. 1961. "Disappointing Mobile". The Times, issue 55100 p. 16, col. E. (en)
- Keller, Hans, Susan Bradshaw, and Alvar Lidell. 1961. "Piotr Zak: Mobile for Tape and Percussion. BBC Third Programme . Hans Keller Online . (en)
- Myers, Rollo H. 1961. "Critic on the Hearth: Music: Too Rarified?". The Listener and B.B.C. Television Review 65, no. 1681 : 1064–65. (en)
- Zak, Pjotr [alias Hans Keller]. 1962. "Zak on Stockhausen". The Musical Times 103, no. 1433 : 484–85. (en)
- Lewis, Anthony. 1961. "B.B.C. Admits a Musical Hoax: Noise by Imaginary Composer". New York Times : 1. (en)
- Garnham, Alison. 2003. Hans Keller and the BBC: The Musical Conscience of British Broadcasting, 1959–79. Aldershot, Hants; Burlington, VT: Ashgate Publishing, Ltd. . (en)
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