1. Boland, R. J. (1986). Phenomenology: a preferred approach to research on information systems. In Trends in information systems (pp. 341-349). North-Holland Publishing Co.
2. Brown, S. R. (1972). A Fundamental Incommensurability between Objectivity and Subjectivity. In S.R. Brown & D.J. Brenner (Eds.), Science, Psychology, and Communication: Essays Honoring William Stephenson. New York: Teachers College Press.
3. The Importance of Factors in Q Methodology: Statistical and Theoretical Considerations;S. R.Brown;Operant Subjectivity,1978
4. A primer on Q methodology.;S. R.Brown;Operant Subjectivity,1993