Lehrer, Keith and Quillen, Keith. 1986. “Chisholm on Certainty.” in Roderick Chisholm, edited by Radu J. Bogdan, pp. 157–168. Profiles n. 7. Dordrecht: D. Reidel Publishing Co.
Quillen, Keith. 1986. “Propositional Attitudes and Psychological Explanation.”Mind and Language 1: 133–157.