Isaac Watts (1832). “The Improvement of the Mind: To which are Added a Discourse on the Education of Children and Youth; and Short Essays on Various Subjects”, p.31
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.961, e-artnow