"The American Democrat: Or, Hints on the Social and Civic Relations of the United States of America". Book by James F. Cooper (Conclusion, p. 191), 1838.
Pat Robertson (1994). “The Collected Works of Pat Robertson: The New Millennium/the New World Order/the Secret Kingdom/3 Books in 1”, Bristol Park Books
George Henry Lewes (1864). “Aristotle: a chapter from the history of science including analyses of Aristotle's scientific writings”, p.26, London : Smith, Elder and Company