John Locke (1824). “The Works of John Locke: Essay concerning human understanding (concluded) Defence of Mr. Locke's opinion concerning personal identity. Of the conduct of the understanding. Some thoughts concerning reading and study for a gentlemen. Elements of natural philosophy. New method of a common-place-book”, p.356
George R. R. Martin (2011). “A Game of Thrones 4-Book Bundle: A Song of Ice and Fire Series: A Game of Thrones, A Clash of Kings, A Storm of Swords, and A Feast for Crows”, p.121, Bantam