John Flavel (1840). “Divine Conduct: Or, The Mystery of Providence, Wherein the Being and Efficacy of Providence are Asserted and Vindicated ... and the Proper Course of Improving All Providences Pointed Out”, p.19
James Pollard Espy, Alfred Osborn Pope Nicholson (1857). “Message from the President of the United States: Communicating, in Compliance with a Resolution of the Senate of July 24, 1854, the Fourth Meteorological Report of Prof. James P. Espy”, p.40