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.1265, Bantam
Thomas Bulfinch (1858). “The Age of Chivalry: Or Legends of King Arthur, "King Arthur and His Knights", "The Mabinogeon", "The Crusades", "Robin Hood", Etc”, p.14
Walter Scott (2015). “Heroes of the Scottish Highlands: Ivanhoe, Waverley and Rob Roy (3 Unabridged Illustrated Classics): Historical Novels from the Author of The Pirate, The Heart of Midlothian, Old Mortality, The Guy Mannering, The Antiquary, The Bride of Lammermoor and Anne of Geierstein”, p.261, e-artnow