William Wordsworth (1837). “The Complete Poetical Works of William Wordsworth: Together with a Description of the Country of the Lakes in the North of England, Now First Published with His Works ...”, p.337
John Muir (1997). “Nature Writings: The Story of My Boyhood and Youth, My First Summer in the Sierra, the Mountains of California, Stickeen, Selected Essays”, p.351, Library of America
"A 4th Course of Chicken Soup for the Soul: More Stories to Open the Heart and Rekindle the Spirit". Book by Jack Canfield (p. 188), September 1, 2012.