Hughes, R.I.G. (ed.) (1993) A Philosophical Companion to First-Order Logic, Indianapolis, IN: Hackett Publishing Company. (New and reprinted papers of varying levels of difficulty.)

Tomberlin, J.E. (ed.) (1994) Logic and Language, Philosophical Perspectives 8, Atascadero, CA: Ridgeview. (A collection of new papers on relevant topics.)