Arthur Conan Doyle (2016). “Sherlock Holmes - The Ultimate Collection: 4 Novels, 56 Short Stories & 5 Extracanonical Works”, p.345, BoD - Books on Demand
Henry David Thoreau, Jeffrey S. Cramer (2007). “I to Myself: An Annotated Selection from the Journal of Henry D. Thoreau”, p.347, Yale University Press