1. Correlations between persons as a research tool;Cronback,1953
2. Q Methodology in Behavioral Research;Kerlinger,1972
3. Foundations of behavioral research;Kerlinger,1973
4. Q-Technique-Description, History, and Critique. Psychotherapy, Theory and Research;Mowrer,1953
5. The study of behavior: Q-Technique and its methodology;Stephenson,1953