Walter Bagehot (2010). “Physics and Politics: Or Thoughts on the Application of the Principles of Natural Selection and Inheritance to Political Society”, p.62, Cambridge University Press
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.1172, Bantam