Gloria Steinem (2017). “Passion, Politics, and Everyday Activism: Collected Essays: Moving Beyond Words; Outrageous Acts and Everyday Rebellions; and Revolution from Within”, p.882, Open Road Media
Edmund Spenser (2008). “The Faerie Queene: Complete in Five Volumes: Book One; Book Two; Books Three and Four; Book Five; Book Six and the Mutabilitie Cantos”, p.155, Hackett Publishing
Benjamin Franklin's letter to David Hartley (December 4, 1789) as quoted in "The Writings of Benjamin Franklin," Volume 10 (p. 72) edited by Albert H. Smyth, 1907.