Frisius, Rudolf. 2008. Karlheinz Stockhausen II: Die Werke 1950–1977; Gespräch mit Karlheinz Stockhausen, "Es geht aufwärts". Mainz, London, Berlin, Madrid, New York, Paris, Prague, Tokyo, Toronto: Schott Musik International. . (en)
Maconie, Robin. 2005. Other Planets: The Music of Karlheinz Stockhausen. Lanham, Maryland, Toronto, Oxford: Scarecrow Press. . (en)
Maconie, Robin. 1990. The Works of Karlheinz Stockhausen, second edition. Oxford: Clarendon Press. . (en)
Maconie, Robin. 1976. The Works of Karlheinz Stockhausen. London, New York, Toronto: Oxford University Press. . (en)
Griffiths, Paul. 1973. Music in London: New Music: Stockhausen. The Musical Times 114, no. 1563 : 503. (en)
Lavery, David. 1980. "Dreaming Nothing". Parabola: Myth and the Quest for Meaning 5, no. 2 : 18–23. (en)
Stockhausen, Karlheinz. 1992. "YLEM für 19 Spieler". Booklet notes for Stockhausen: Ylem: 2 Versionen, 1973. Stockhausen Complete Edition CD 21. Kürten: Stockhausen-Verlag. (en)
Peters, Günter. 1999. "'How Creation Is Composed': Spirituality in the Music of Karlheinz Stockhausen", translated by Mark Schreiber and the author. Perspectives of New Music 37, no. 1 : 96–131. (en)
Sadie, Stanley. 1973. "A Period of Cosmography: Stockhausen, Queen Elizabeth Hall". The Times : 11. (en)
Stockhausen, Karlheinz. 1978. "Ylem für 19 Spieler/Sänger " in his Texte zur Musik 4, edited by Christoph von Blumröder, 212–213. DuMont Dokumente. Cologne: Verlag M. DuMont Schauberg. . (en)