"The Papers of Martin Luther King, Jr., Volume IV: Symbol of the Movement, January 1957-December 1958". Book by Martin Luther King, Clayborne Carson, Peter Holloran, Ralph Luker, Penny A. Russell (University of California Press), p. 211, 1992.
John Dryden (1808). “The Works of John Dryden: Now First Collected in Eighteen Volumes. Illustrated with Notes, Historical, Critical, and Explanatory, and a Life of the Author”, p.349