Jane Roberts (2011). “The Nature of Personal Reality (A Seth Book): Specific, Practical Techniques for Solving Everyday Problems and Enriching the Life You Know”, p.81, Amber-Allen Publishing
Thomas Jefferson, James Madison, John Caldwell Calhoun (1832). “The Virginia and Kentucky Resolutions of 1798 and '99: With Jefferson's Original Draught Thereof. Also, Madison's Report, Calhoun's Address, Resolutions of the Several States in Relation to State Rights. With Other Documents in Support of the Jeffersonian Doctrines of '98”, p.15