Andrew Dickson White (2012). “A History of the Warfare of Science with Theology in Christendom: From Creation to the Victory of Scientific and Literary Methods”, p.40, Transaction Publishers
Helmut Friedel, Tina Dickey, Hans Hofmann, Städtische Galerie im Lenbachhaus München (1998). “Hans Hofmann: Wunder Des Rhythmus und Schönheit Des Raumes : [exhibition at the Städtische Galerie Im Lenbachaus in Munich, from 23 April to 29 June 1997, Schirn Kunsthalle, Frankfurt, from 12 September to 2 November 1997 ]”, p.97, Hudson Hills