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
Noah Webster (1787). “An Examination Into the Leading Principles of the Federal Constitution Proposed by the Late Convention Held at Philadelphia: With Answers to the Principal Objections that Have Been Raised Against the System”, p.43
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.