1. The concept of rigidity: An enigma;International Journal for the Advancement of Counselling;1983
2. Free Speech Advocates at Berkeley;The Journal of Applied Behavioral Science;1966-03
3. The Relationship Between Authoritarianism, Rigidity, and Anxiety;The Journal of General Psychology;1964-07
4. Rigidity: A flexible concept.;Psychological Bulletin;1959
5. Abnormal and Personality Correlates of Certainty;Journal of Mental Science;1959-01