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
Octavio Paz (1985). “The Labyrinth of Solitude: And the Other Mexico ; Return to the Labyrinth of Solitude ; Mexico and the United States ; The Philanthropic Ogre”, p.212, Grove Press