David Cline, The Graph Music of Morton Feldman (Cambridge: Cambridge University Press, 2016), ISBN 978-1-107-10923-0 (hb). - Alistair Noble, Composing Ambiguity: The Early Music of Morton Feldman (Abingdon, UK: Routledge, 2016 [2013]), ISBN 978-1-138-27053-4 (pb), ISBN: 978-1-4094-5164-8 (hb).