Larkin, Jill and Simon, Herbert A. 1987. “Why a Diagram Is (Sometimes) Worth 10000 Words.”Cognitive Science 11: 65–69. Reprinted in Glasgow, Narayanan and Chandrasekaran (1995, 69–109).
Further References
Glasgow, Janice, Narayanan, N. Hari and Chandrasekaran, B., eds. 1995. Diagrammatic Reasoning. Cambridge, Massachusetts: The MIT Press.