George R. R. Martin (2012). “George R. R. Martin's A Game of Thrones 5-Book Boxed Set (Song of Ice and Fire Series): A Game of Thrones, A Clash of Kings, A Storm of Swords, A Feast for Crows, and and A Dance with Dragons”, p.994, Bantam
Diana Gabaldon (2015). “The Outlander Series 8-Book Bundle: Outlander, Dragonfly in Amber, Voyager, Drums of Autumn, The Fiery Cross, A Breath of Snow and Ashes, An Echo in the Bone, Written in My Own Heart's Blood”, p.1529, Dell
John Esten Cooke, Robert E. Lee (2017). “General Robert E. Lee: The True Story of the Infamous “Marble Man”: The Life & Legacy of Robert E. Lee, Including & Personal Writings, Speeches and Orders”, p.42, Madison & Adams
"Jarvis Cocker answers your questions: 'Go on, then, give us the horrible ones'". Interview with Miranda Sawyer, www.theguardian.com. November 26, 2011.
William Kingdon Clifford (1884). “The Scientific Basis of Morals: And Other Essays, Viz. : Right and Wrong, the Ethics of Belief, the Ethics of Religion”