1. Dennett, D. C. (1991). Consciousness explained. Boston: Little, Brown & Co.
2. Dennett, D. C. (1998). Hofstadter’s quest: a tale of cognitive pursuit. Brainchildren: essays on designing minds. Cambridge, MA: MIT Press.
3. Descartes, R. (1984). The philosophical writings of Descartes, vol 2. In J. Cottingham, R. Stoothoff, & D. Murdoch (Eds.), Trans. Cambridge: Cambridge University Press.
4. Goodman, N. (1978). Ways of worldmaking. Indianapolis: Hackett.
5. James, W. [1890] (1950). The principles of pscyhology, vol 2. Dover: Henry Holt.