Sciabarra, Chris Matthew (2013). Ayn Rand: The Russian Radical. University Park, Pennsylvania: Pennsylvania State University Press. — p. 1;
Badhwar, Neera; Long, Roderick T. (July 5, 2012). Zalta, Edward N. (ed), ed. «Ayn RandАрхивная копия от 26 марта 2020 на Wayback Machine». Stanford Encyclopedia of Philosophy. Retrieved December 30, 2014.;
Gotthelf, Allan (2000). On Ayn Rand. Wadsworth Publishing. — p. 1;
Machan, Tibor R. (2000). Ayn Rand. Masterworks in the Western Tradition. New York: Peter Lang Publishing. — p. 9;
Gladstein, Mimi Reisel (1999). The New Ayn Rand Companion. Westport, Connecticut: Greenwood Press — p. 2;
Heyl, Jenny A. (1995). «Ayn Rand (1905—1982)». In Waithe, Mary Ellen (ed). Contemporary Women Philosophers: 1900-today. A History of Women Philosophers series. Boston: Kluwer Academic Publishers. p. 223;
Den Uyl, Douglas; Rasmussen, Douglas B., eds. (1984). The Philosophic Thought of Ayn Rand. University of Illinois Press. — p. 36
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Robin C.Garbage and Gravitas (неопр.). The Nation (20 мая 2010). Дата обращения: 1 февраля 2020. Архивировано из оригинала 14 мая 2011 года.
Sciabarra, Chris Matthew (2013). Ayn Rand: The Russian Radical. University Park, Pennsylvania: Pennsylvania State University Press. — p. 1;
Badhwar, Neera; Long, Roderick T. (July 5, 2012). Zalta, Edward N. (ed), ed. «Ayn RandАрхивная копия от 26 марта 2020 на Wayback Machine». Stanford Encyclopedia of Philosophy. Retrieved December 30, 2014.;
Gotthelf, Allan (2000). On Ayn Rand. Wadsworth Publishing. — p. 1;
Machan, Tibor R. (2000). Ayn Rand. Masterworks in the Western Tradition. New York: Peter Lang Publishing. — p. 9;
Gladstein, Mimi Reisel (1999). The New Ayn Rand Companion. Westport, Connecticut: Greenwood Press — p. 2;
Heyl, Jenny A. (1995). «Ayn Rand (1905—1982)». In Waithe, Mary Ellen (ed). Contemporary Women Philosophers: 1900-today. A History of Women Philosophers series. Boston: Kluwer Academic Publishers. p. 223;
Den Uyl, Douglas; Rasmussen, Douglas B., eds. (1984). The Philosophic Thought of Ayn Rand. University of Illinois Press. — p. 36
