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.645, Bantam
Henry Cloud (2011). “Necessary Endings: The Employees, Businesses, and Relationships That All of Us Have to Give Up in Order to Move Forward”, p.21, Harper Collins