Rand 1964, p. 22;。意志作用に関するランドの理論の詳細はBinswanger, Harry (December 1991). “Volition as Cognitive Self-Regulation”. Organizational Behavior and Human Decision Processes50 (2): 154–178. doi:10.1016/0749-5978(91)90019-P.、Branden, Nathaniel (1969). “Man: A Being of Volitional Consciousness”. The Psychology of Self-Esteem. Los Angeles: Nash Publishing. ISBN0-8402-1109-0、Peikoff 1991, pp. 55–72を参照
Long, Roderick T. (2000). Reason and Value: Rand versus Aristotle. Objectivist Studies Monographs. Poughkeepsie, New York: The Objectivist Center. ISBN1-57724-045-6. OCLC49875339