Rudyard Kipling (2015). “ULTIMATE Collection of Rudyard Kipling: His Greatest Works in One Volume (Illustrated Edition): The Jungle Book, The Man Who Would Be King, Just So Stories, Kim, The Light That Failed, Captain Courageous, Plain Tales from the Hills”, p.881, e-artnow
Henry David Thoreau, Jeffrey S. Cramer (2007). “I to Myself: An Annotated Selection from the Journal of Henry D. Thoreau”, p.163, Yale University Press