Albert Schweitzer, William Larimer Mellon (1996). “Brothers in Spirit: The Correspondence of Albert Schweitzer and William Larimer Mellon, Jr”, p.18, Syracuse University Press
Richard Cecil, Josiah PRATT (the Elder.) (1854). “Remains of the Rev. Richard Cecil ... With a view of his character, by the Rev. Josiah Pratt ... To which is prefixed a memoir of his life signed: J. Cecil . Tenth edition”, p.137