Ian Collins, Modernism and memory : Rhoda Pritzker and the art of collecting, Yale Center for British Art, New Haven, 2016, pp. 140, 141, 201, fig. 85, 201 fig., N6768 .M635 2016 OVERSIZE (YCBA)Margaret Garlake, The sculpture of Reg Butler, Henry Moore Foundation, Hertfordshire, U.K., p. 145, no. 162, NJ18.B983 G37 2006+ (YCBA)