Further discussions:
Ayn Rand, "The Objectivist Ethics," in The Virtue of Selfishness: A New Concept of Egoism (New York: The New American Library, 1964), p. 21.
Leonard Peikoff, Objectivism: The Philosophy of Ayn Rand (New York: Dutton, 1991), pp. 267-276.
Tara Smith, Viable Values: A Study of Life as the Root and Reward of Morality (Lanham, Maryland: Rowman & Littlefield Publishers, Inc., 2000), pp. 166-167.
Tara Smith, "The Metaphysical Case for Honesty," The Journal of Value Inquiry v. 37 (2003), pp. 517-531. [Available through the Electronic Journal Locator of UGA Libraries.]
Tara Smith, Ayn Rand's Normative Ethics: The Virtuous Egoist (Cambridge: Cambridge University Press, 2006), pp. 75-105.