"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.
Frances Wright, Cairns Collection of American Women Writers (1834*). “Course of popular lectures: with three addresses, on various public occasions, and a reply to the charges against the French reformers of 1789”