Robert E. Howard (2016). “THE CTHULHU MYTHOS – Complete Collection: The Children of the Night, The Black Stone, The Thing on the Roof, The Challenge From Beyond & The Fire of Asshurbanipal: The Gateway into the Ancient Dimension of Terror Inhabited with Unspeakable Creatures, a Pantheon of Alien Extra-Dimensional Deities and Mythical Horrors Which Predate Humanity”, p.14, e-artnow
"The Metropolis and Modern Life" by Georg Simmel (1903), translated by Kurt Wolff in "The Sociology of Georg Simmel" edited by D. Weinstein, New York: Free Press, (p. 422), 1950.
Aldo Leopold (2013). “Aldo Leopold: A Sand County Almanac & Other Writings on Conservation and Ecology: (Library of America #238)”, p.557, Library of America