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.83, David R. Godine Publisher
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.30, Harvard University Press
"The Superinvestors of Graham-and-Doddsville". Essay by Warren Buffett published in Hermes, the Columbia Business School Magazine (1984), later quoted in "31 years ago, Warren Buffett revealed the secret to investing and correctly predicted nobody would listen" by Myles Udland, www.businessinsider.com. August 24, 2015.
Alexander Pope (1828). “An Essay on Man: In Four Epistles to H. St. John, Lord Bolingbroke. With Notes Illustrative of the Grammatical Construction, Designed as a Text-book for Parsing”, p.26