"Richardson's Model as a Markov Process" in John V. Gillespie and Dina A. Zinnes, eds. Mathematical Models in International Relations. New York: Praeger, pp. 156-175, 1976, Box: 8, Folder: 12. Personal papers of Philip Schrodt, PP 496. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/114034 Accessed May 16, 2024.