Charles Sanders Peirce, Nathan Houser, Christian J.W. J. W. Kloesel (1992). “The Essential Peirce, Volume 1: Selected Philosophical Writings? (1867–1893)”, p.142, Indiana University Press
John Stuart Mill (1865). “An Examination of Sir William Hamilton's Philosophy and of the Principal Philosophical Questions Discussed in His Writings”, p.531
William Stanley Jevons (1870). “Elementary Lessons in Logic: Deductive and Inductive : with Copious Questions and Examples and a Vocabulary of Logical Terms”, p.6