Held, Richard Image, object, and illusion : readings from Scientific American / With introductions by Richard Held - 1st ed. - San Francisco : W. H. Freeman, 1974. - 137p. : illus. Bibliography: p. [132]-134. ISBN: 0716705052 0716705044 Subjects--Topical Terms: Optical illusions.Psychology Dewey Class. No.: 612.84