1. The methodology of Q-analysis applied to social systems. In (Ed.), Recent developments in systems methodology for social science research. Boston: Martinus Nijhoff, 1979.
2. Cluster analysis. In (Ed.), Sociological Methodology 1975. San Francisco: Jossey-Bass, 1974.
3. Sociological classification and cluster analysis. Unpublished manuscript. Los Angeles: University of California, 1982a.
4. Relationships among conceptual, abstracted, and concrete systems. Unpublished manuscript. Los Angeles: University of California, 1982b.
5. Clusters as systems. Unpublished manuscript. Los Angeles: University of California, 1982c.