Fulton J. Sheen (2009). “God and Intelligence in Modern Philosophy: A Critical Study in the Light of the Philosophy of Saint Thomas”, p.1, Wipf and Stock Publishers
"Artists on Art - from the 14th - 20th centuries". Book edited by Robert Goldwater and Marco Treves; Pantheon Books, London, p. 410, 'Notes d'un Peintre' (Notes of a Painter), 1972.