Ed Hindson, Ergun Caner (2008). “The Popular Encyclopedia of Apologetics: Surveying the Evidence for the Truth of Christianity”, p.254, Harvest House Publishers
James C. Humes, Benjamin Franklin (1995). “The wit and wisdom of Benjamin Franklin: a treasury of more than 900 quotations and anecdotes”, Harpercollins
Benjamin Franklin, William-Temple Franklin (1818). “Memoirs of the Life and Writings of (the Same), Continued to the Time of His Death by William Temple Franklin. - London, H. Colburn 1818”, p.396