1. Albers, J. (1963). Interaction of color. Yale University Press. Quotations following here are taken, in sequence, from pp. 73, 72 and 44.
2. Aldrich, V. C. (1968). Visual metaphor. Journal of Aesthetic Education, 2, 73.
3. Aldrich, V. C. (1971). Form in the visual arts. British Journal of Aesthetic, 11, 215.
4. Aldrich, V. C. (n.d.). Form in the visual arts, Ref. 8, p. 223.
5. Beckmann, M. (1971). From a lecture given at the New Burlington Galleries, London, 1938. In E. Protter (Ed.), Painters on painting (p. 211). New York.