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.161, Bantam
John Bunyan (2013). “The Pilgrim’s Progress Simplified: Includes Modern Translation, Study Guide, Historical Context, Biography, and Character Index”, p.125, BookCaps Study Guides