Brown 1980: Political Subjectivity
Brown, Steven R. (1980). Political subjectivity. New Haven, CT: Yale University Press. Download PDF (96MB file)
van Exel and de Graaf 2005: A Q Methodology Sneak Preview
This document is compiled from what we think is the key literature on Q methodology. References are provided throughout the text and readers are encouraged to look up the original materials.

Watts and Stenner (2012): Doing Q Methodological Research – Theory, Methods and Interpretation
Watts, S., & Stenner, P. (2012). Doing Q Methodological Research: Theory, Method and Interpretation. London, Thousand Oaks CA, New Delhi, Singapore: Sage Publications

McKeown and Thomas 2013: Q Methodology
McKeown, Bruce & Thomas, Dan (2013): Q Methodology. 2nd ed. Newbury Park: Sage Publications.