David Hume, Eric Steinberg (1992). “An Enquiry Concerning Human Understanding; [with] A Letter from a Gentleman to His Friend in Edinburgh; [and] An Abstract of a Treatise of Human Nature”, p.14, Hackett Publishing
Nancy Spannaus, Christopher White, Alexander Hamilton, Thomas More, Henry VIII (2015). “The Political Economy of the American Revolution”, p.346, Executive Intelligence Review
Frances Wright (1829). “Course of popular lectures; with 3 addresses on various public occasions, and a reply to the charges against the French reformers of 1789”, p.45