Heraclitus of Ephesus (2017). “Heraclitus on the two antithetical forces in life: Interdependent and mutually convertible aspects of One Cause”, p.5, Philaletheians UK
Octavio Paz (1985). “The Labyrinth of Solitude: And the Other Mexico ; Return to the Labyrinth of Solitude ; Mexico and the United States ; The Philanthropic Ogre”, p.212, Grove Press
Philip Doddridge, John Doddridge HUMPHREYS (1839). “Scriptural Hymns ... New and corrected edition, containing many hymns never before printed. Edited ... by ... J. D. Humphreys, etc”, p.232
Jen Lancaster (2010). “My Fair Lazy: One Reality Television Addict's Attempt to Discover If Not Being A Dumb Ass Is t he New Black; Or, A Culture-Up Manifesto”, p.34, Penguin