Humphreys P. The New Theory of Reference. Fetzer J, editor. Dordrecht: Kluwer Academic Publishers; 1998.
Brown S, Collinson D, Wilkinson R. Biographical dictionary of twentieth-century philosophers. Routledge; 1996.
Patrick Suppes, Scientific Philosopher (edited collection). Volume 1: Probability and Probabilistic Causality. Volume 2: Philosophy of Physics, Theory Structure, Measurement Theory. Volume 3: Philosophy of Language, Logic, Action and Learning Theory. Dordrecht: Kluwer Academic Publishers; 1994.