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.118
David Hume (1788). “An inquiry concerning human understanding. A dissertation on the passions. An inquiry concerning the principles of morals. The natural history of religion”, p.90
David Hume, Thom Chittom (2004). “An Enquiry Concerning Human Understanding: And Selections from a Treatise of Human Nature”, p.200, Barnes & Noble Publishing