James C. Humes, Benjamin Franklin (1995). “The wit and wisdom of Benjamin Franklin: a treasury of more than 900 quotations and anecdotes”, Harpercollins
Sir Thomas Browne (1852). “The Works of Sir Thomas Browne: Hydriotaphia. Brampton urns. A letter to a friend, upon occasion of the death of his intimate friend. Christian morals, &c. Miscellany tracts. Repertorium. Miscellanies. Domestic correspondence, journals, &c. Miscellaneous correspondence”, p.43