De Kooning : paintings, 1960-1980 : Kunstmuseum Basel / mit Beiträgen von Bernhard Mendes Bürgi, Klaus Kertess, Ralph Ubi ; [Herausgeber, Bernhard Mendes Bürgi]
Doris Chanin Freedman. Doris C. Freedman, Ellie Amel and Klaus Kertess memorandum to Citizens for Artist Housing, 1971 July 7. SoHo Artists Association records, 1968-1978. Archives of American Art, Smithsonian Institution.