Albert Einstein (2015). “Bite-Size Einstein: Quotations on Just About Everything from the Greatest Mind of the Twentieth Century”, p.15, St. Martin's Press
Henry David Thoreau (2014). “Citizen Thoreau: Walden, Civil Disobedience, Life Without Principle, Slavery in Massachusetts, A Plea for Captain John Brown”, p.131, Graphic Arts Books
Henry Beston, Elizabeth Jane Coatsworth (2001). “The Best of Beston: A Selection from the Natural World of Henry Beston from Cape Cod to the St. Lawrence”, p.18, David R. Godine Publisher
B. L. Rayner, Thomas Jefferson (1834). “Life of Thomas Jefferson: with selections from the most valuable portions of his voluminious and unrivalled private correspondence : with portrait”, p.394