Speech on the Federal Constitution, Virginia Ratifying Convention, on June 09, 1788. "The Debates in the Several State Conventions on the Adoption of the Federal Constitution". Book edited by Jonathan Elliot, volume 3, p. 168-169, 1836.
Joseph Story (1865). “A Familiar Exposition of the Constitution of the United States: Containing a Brief Commentary on Every Clause, Explaining the True Nature, Reasons, and Objects Thereof; Designed for the Use of School Libraries and General Readers”, p.264
William Blackstone, St. George Tucker (1996). “Blackstone's Commentaries: With Notes of Reference to the Constitution and Laws, of the Federal Government of the United States, and of the Commonwealth of Virginia: With an Appendix to Each Volume, Containing Short Tracts Upon Such Subjects as Appeared Necessary to Form a Connecte”, p.315, The Lawbook Exchange, Ltd.