Albert Einstein, Stephen W. Hawking (2007). “A Stubbornly Persistent Illusion: The Essential Scientific Works of Albert Einstein”, p.337, Running Press
Albert Einstein (2013). “Einstein on Politics: His Private Thoughts and Public Stands on Nationalism, Zionism, War, Peace, and the Bomb”, p.373, Princeton University Press
Benjamin Disraeli, Edmund Gosse, Robert Arnot (1904). “The Works of Benjamin Disraeli, Earl of Beaconsfield, Embracing Novels, Romances, Plays, Poems, Biography, Short Stories and Great Speeches: Coningsby, v. 2. Selected speeches”