1. Strato of Lampsacus. (1950). Fragments. In F. Wehrli (Ed.), Die Schule des Aristoteles (Vol. V). Basel: Schwabe.
2. Baldes, R. W. (1975). Democritus on visual perception: Two theories or one? Phronesis, 20, 93–105.
3. The arguments of the philosophers;J Barnes,1996
4. Barney, R. (1992). Appearances and impressions. Phronesis, 37, 283–313.
5. Bolton, R. (2005). Perception naturalized in Aristotle’s De anima, in Salles (Ed.), 209–244.