"Treasury of the Christian Faith: An Encyclopedic Handbook of the Range and Witness of Christianity". Book by Stanley Irving Stuber and Thomas Curtis Clark, 1949.
Michael Faraday's letter to John Tyndall (April 19, 1851) as quoted in "The correspondence of Michael Faraday", Volume 4, edited by Frank A. J. L. James, 1999.
Michael Faraday, Christian Friedirich Schoenbein (1899). “The letters of Faraday and Schoenbein 1836-1862: With notes, comments and references to contemporary letters”