Henry David Thoreau, Jeffrey S. Cramer (2007). “I to Myself: An Annotated Selection from the Journal of Henry D. Thoreau”, p.439, Yale University Press
Henry David Thoreau (2017). “Journeys, Adventures & Life in Harmony with Nature – 6 Book Collection (Illustrated): Including Walden, A Week on the Concord and Merrimack Rivers, The Maine Woods, Cape Cod, A Yankee in Canada & Canoeing in the Wilderness - North American Highlands Series”, p.47, e-artnow
Henry David Thoreau, Carol Spenard LaRusso (2012). “The Green Thoreau: America's First Environmentalist on Technology, Possessions, Livelihood, and More”, p.24, New World Library