Richard Whately (1858). “Elements of Rhetoric: Comprising an Analysis of the Laws of Moral Evidence and of Persuasion : with Rules for Argumentative Composition and Elocution”, p.247
Diary entry. "Diary and Letters of Rutherford Birchard Hayes: Nineteenth President of the United States". Book edited by Charles Richard Williams, The Ohio State Archaeological and Historical Society, June 05, 1862.