Marshall McLuhan, W. Terrence Gordon, Elena Lamberti, Dominique Scheffel-Dunand (2011). “The Gutenberg Galaxy: The Making of Typographic Man”, p.183, University of Toronto Press
"The Ballot or The Bullet (Cleveland Version)". Malcolm X's speech at Cory Methodist Church in Cleveland, Ohio (April 3, 1964) as quoted in "Malcolm X Speaks: Selected Speeches and Statements" edited by George Breitman (pp. 23-44), 1965.