New York, 21 May 1947 - Institutional correspondence Alfred H. Barr Jr.'s letter to Daniel-Henry Kahnweiler, dated 21 May 1947
New York, 31 July 1947 - Personal correspondence Alfred H. Barr Jr's letter to. a Bertha Slattery Lieberman
Alfred H. Barr Jr. (ed.), exh. cat., New York: MoMA, 1946 - Catalogue Picasso: Fifty Years of His Art