David Hume (1826). “The Philosophical Works: Including All the Essays, and Exhibiting the More Important Alterations and Corrections in the Successive Ed. Publ. by the Author”, p.9
David Hume (1874). “A Treatise on Human Nature: Being an Attempt to Introduce the Experimental Method of Reasoning Into Moral Subjects; and Dialogues Concerning Natural Religion”, p.306
David Hume (1824). “The Philosophical Works of David Hume ... Containing Dialogues Concerning Natural Religion, Essays on the Immortality of the Soul, Suicide ... &c. A New Edition”, p.116
David Hume (1824). “The Philosophical Works of David Hume ... Containing Dialogues Concerning Natural Religion, Essays on the Immortality of the Soul, Suicide ... &c. A New Edition”, p.24
David Hume, Eric Steinberg (1993). “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.111, Hackett Publishing
David Hume (1854). “The Philosophical Works of David Hume: Including All the Essays, and Exhibiting the More Important Alterations and Corrections in the Successive Editions Pub. by the Author”, p.9