1. Arnold, V. I. (1997). On Teaching Mathematics. The long text of his hard-hitting address and traces of its aftershocks are easily found by googling his name.
2. Cassam, Q. (2007). The Possibility of Knowledge. Oxford: Oxford University Press.
3. Cassirer, E. (1953). The Philosophy of Symbolic Forms. New Haven: Yale University Press, Four volumes.
4. Croft, W., and Cruse, D. A. (2004). Cognitive Linguistics. Cambridge: Cambridge University Press.
5. diSessa, A. (1993). Toward an epistemology of physics. Cognition & Instruction, 10, 105–225.