1. Aristotle (trans., 1984). On the soul. In J. Barnes (Ed.),The complete works of Aristotle (Vol. 1, pp. 641–692). Princeton, NJ: Princeton University Press.
2. Baird, J. C., &Biersdorf, W. R. (1967). Quantitative functions for size and distance judgments.Perception & Psychophysics,2, 161–166.
3. Cuijpers, R. H., Kappers, A. M. L., &Koenderink, J. J. (2002). Visual perception of collinearity.Perception & Psychophysics,64, 392–404.
4. Descartes, R. (1955). Rules for the direction of the mind. In E. S. Haldane & G. R. T. Ross (Eds. and Trans.),The philosophical works of Descartes (Vol. 1, pp. 1–77). New York: Dover. (Original work published 1628)
5. Vol. 1; H. E. Adler, Trans.;G. T. Fechner,1966