1. : Space, Time, and Deity;Alexander;2 vols New York,1966
2. Ardrey, Robert (1961): African Genesis: A Personal Investigation into the Animal Origins and Nature of Man. New York: Macmillan.
3. Ardrey, Robert (1966): The Territorial Imperative: A Personal Inquiry into the Animal Origins of Property and Nations. New York: Atheneum.
4. Aristotle - McKeon, Richard, ed. (2001): The Basic Works of Aristotle. New York: Random House/Modern Library. Original work published in 1941.
5. Arrhenius, Svante A. (2008): Worlds in the Making: The Evolution of the Universe. New York: Harper & Brothers. Original work published 1908.