1. Teilhard de Chardin, The Phenomenon of Man (New York: Harper and Row, 1961).

2. Philip Guston, "Piero della Francesca: The Impossibility of Painting," Art News (May 1965).

3. Morton Feldman, "The Anxiety of Art," Art in America (September-October 1973).

4. Robert Creeley, "Philip Guston: A Note," Black Mountain Review (Spring 1956).

5. Stanley Kunitz, "After the Last Dynasty," Poetry (October-November 1962).

6. Stanley Kunitz, "Open the Gates," Selected Poems, 1928 - 58 (Boston: Little, Brown, 1958).

7. Kafka, quoted in William Berkson, "Dialogues with Philip Guston," op. cit.

8. Philip Guston, "Faith, Hope, and Impossibility," Art News Annual XXXI (October 1966).

9. Susanne K. Langer, Philosophical Sketches (Baltimore: Johns Hopkins, 1962).

10. Hilton Kramer, "Abstractions of Guston Still Further Refined," The New York Times, January 1, 1965.

11. Guston, in interview with Karl Fortess, op. cit.

12. David Sylvester, "Philip Guston," The New Statesman, February 15, 1963.

13. John Russell, "Beyond Nature," The Sunday Times (London), January 20, 1963.