Caleb Scharf (2012). “Gravity's Engines: How Bubble-Blowing Black Holes Rule Galaxies, Stars, and Life in the Cosmos”, p.187, Scientific American / Farrar, Straus and Giroux
Joseph Conrad (2015). “The Complete Works of Joseph Conrad: 20 Novels & 26 Short Stories (Including Memoirs, Essays & Letters in One Single Edition): Classics of World Literature from One of the Greatest English Novelists: Heart of Darkness, The Duel, Lord Jim, The Secret Agent, Nostromo, The Shadow-Line & Under Western Eyes”, p.2084, e-artnow
Alexander Pope, William Roscoe (1847). “The works of Alexander Pope, esq., with notes and illustrations, by himself and others. To which are added, a new life of the author, an Estimate of his poetical character and writings, and occasional remarks by William Roscoe, esq”, p.33