1. BAIRED, J. C. 1968 Toward a theory of frontalsize judgments. Percept. & Psychophys., 4, 49-53.
2. BLESSING, W. W., LANDAUER, A. A., & COLTHEART, M. 1967 The effect of false perspective cues on distance- and size- judgments: An examination of the invariance hypothesis. Amer. J. Psychol., 80, 250-256.
3. ENGEL, G., & PARDUCCI, A. 1961 Value of background in the specification of the stimulus for judgment. Amer. J. Psychol., 74, 569-575.
4. GIBSON, J. J. 1950 The perception of the visual world. Boston: Houghton Mifflin.
5. GIBSON, J. J. 1959 Perception as a function of stimulation. In S. Koch (Ed.), Psychology: A study of a science. Vol.1. New York: McGraw-Hill, Pp. 456-501.