Ralph Waldo Emerson, Robert Ernest Spiller, Alfred Riggs Ferguson, Joseph Slater, Jean Ferguson Carr (1971). “The Collected Works of Ralph Waldo Emerson: Nature, addresses, and lectures”, p.107, Harvard University Press
Martin Farquhar Tupper (1857). “Complete poetical works: containing: Proverbial philosophy, A thousand lines, Hactenus, Geraldine, and miscellaneous poems. With a portrait of the author”, p.200