Malcolm X's speech at the Oxford Union debate (December 3, 1964) as quoted in Saladin Ambar "Malcolm X at Oxford Union: Racial Politics in a Global Era" (p. 174), 2013.
George Orwell (2001). “Orwell's England: the Road to Wigan Pier in the context of essays, reviews, letters and poems selected from the Complete works of George Orwell”, ePenguin
Joseph Priestley, Henry Ware (1834). “Views of Christian truth, piety, and morality: selected from the writings of Dr. Priestley : with a memoir of his life”, p.171