"An Essay on the Aristocratic Radicalism of Friedrich Nietzsche". Essay by Georg Brandes (1889), as translated in "Friedrich Nietzsche" by A.G. Chater (p. 21), 1914.
"John F. Nash Jr. - Biographical". "Les Prix Nobel" ("The Nobel Prizes 1994") edited by Tore Frängsmyr, Nobel Foundation, Stockholm, www.nobelprize.org. 1995.
"Ever Since Darwin: Reflections in Natural History". Book by Stephen Jay Gould. "Why We Should Not Name Human Races - A Biological View", p. 231, 1977.