Roberts B; Harris MG; Yates TA. (2005). "The roles of inducer size and distance in the Ebbinghaus illusion (Titchener circles) ". Perception. 34 (7): 847–56. doi:10.1068/p5273. PMID16124270.
M.A. Goodale; A.D. Milner (January 1992). "Separate pathways for perception and action". Trends in Neuroscience. 15 (1): 20–25. doi:10.1016/0166-2236(92)90344-8. PMID1374953.
Roberts B; Harris MG; Yates TA. (2005). "The roles of inducer size and distance in the Ebbinghaus illusion (Titchener circles) ". Perception. 34 (7): 847–56. doi:10.1068/p5273. PMID16124270.
M.A. Goodale; A.D. Milner (January 1992). "Separate pathways for perception and action". Trends in Neuroscience. 15 (1): 20–25. doi:10.1016/0166-2236(92)90344-8. PMID1374953.