
Einleitung zu meiner Apologie (1787) p. 39.
Escher's note in a 1960 book introduction; as cited in 'Metamorphosis', in Biography of M.C. Escher http://im-possible.info/english/articles/escher/escher.html
1950's
Einleitung zu meiner Apologie (1787) p. 39.
Source: 2000 - 2011, Cy Twombly, 2000', by David Sylvester (June 2000), p. 173
1926 - 1941, Autobiography of the artist' (1941)
in Henry Moore on Sculpture, James, Philip, New York: Viking Press, (1967), p. 68
1955 - 1970
Part III, Chapter 18, A Month with Gokhale II
1920s, An Autobiography (1927)
Hunger of Memory: The Education of Richard Rodriguez (1982)