John Jacob Abel, Otto Folin, Theobald Smith (1915). “Experimental and chemical studies of the blood: with an appeal for more extended chemical training for the biological and medical investigator”
Hannah Arendt (1972). “Crises of the Republic: Lying in Politics; Civil Disobedience; On Violence; Thoughts on Politics and Revolution”, p.89, Houghton Mifflin Harcourt
David Hume, Thom Chittom (2004). “An Enquiry Concerning Human Understanding: And Selections from a Treatise of Human Nature”, p.200, Barnes & Noble Publishing