Stephen Wolfram. Cellular Automata and Complexity: Collected Papers. Reading, Mass.: Addison-Wesley, 1993. A collection of Wolfram's technical papers exploring the foundations of science and complexity.

Stephen Wolfram. The Mathematica Book (3rd ed.). New York: Wolfram Media and Cambridge University Press, 1996. The definitive book about Wolfram's Mathematica software system.

Stephen Wolfram. A New Kind of Science. Forthcoming. Wolfram's magnum opus describing his new direction for science.