Oliver Wendell Holmes, Richard A. Posner (1997). “The Essential Holmes: Selections from the Letters, Speeches, Judicial Opinions, and Other Writings of Oliver Wendell Holmes, Jr.”, p.95, University of Chicago Press
Oliver Wendell Holmes (1943). “The Mind and Faith of Justice Holmes: His Speeches, Essays, Letters, and Judicial Opinions”, p.444, Transaction Publishers
Oliver Wendell Holmes (1887). “The "Breakfast-table" Series: The Autocrat of the Breakfast-table; The Professor at the Breakfast- Table; The Poet at the Breakfast- Table”