William Fleming, Charles Porterfield Krauth (1860). “The Vocabulary of Philosophy, Mental, Moral and Metaphysical: With Quotations and References; for the Use of Students”, p.230
William Fleming, Charles Porterfield Krauth (1860). “The Vocabulary of Philosophy, Mental, Moral and Metaphysical: With Quotations and References; for the Use of Students”, p.95
William Fleming (1857). “The Vocabulary of Philosophy, Mental, Moral, and Metaphysical: With Quotations and References; for the Use of Students”, p.264
William Fleming, Charles Porterfield Krauth (1860). “The Vocabulary of Philosophy, Mental, Moral and Metaphysical: With Quotations and References; for the Use of Students”, p.409