Mark Twain, Michael Barry Frank, Robert Pack Browning, Lin Salamo, Frederick Anderson, Mark Twain (1980). “Mark Twain's Notebooks & Journals, Volume III: (1883-1891)”, p.399, Univ of California Press
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.400
Chogyam Trungpa (2010). “The Collected Works of Chogyam Trungpa: Volume Seven: The Art of Calligraphy (Excerpts); Dharma Art; Visual Dharma (Excerpts); Selecte d Poems; Selected Writings”, p.150, Shambhala Publications
Randolph Spencer Churchill, Winston Churchill, Martin Gilbert (1983). “Winston S. Churchill: Companion Vol. V, Part Three, the Coming of War 1936-1939”, Houghton Mifflin Harcourt (HMH)