Text:

Saul Kripke, Naming and Necessity (Blackwell, 1980).

On line:

Hilary Putnam, “Meaning and Reference,” The Journal of Philosophy, vol. 70 (1973), pp. 699-711 (on JSTOR at 2025079)

Michael Dummett, “Postscript” to Synthese, vol. 27, nos. 3/4 (1974), pp. 523-534 (on JSTOR at 20114942)

David Chalmers, “Consciousness and its Place in Nature,” in S. Stich and F. Warfield (eds.), Blackwell Guide to the Philosophy of Mind (Blackwell, 2003)—and on line at http://consc.net/papers/nature.pdf