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.1914, Bantam
Frederick William Robertson (1850). “An address delivered to the members of the Working Man's Institute, at the Town Hall, Brighton, on Thursday, April 18, 1850, on the question of the introduction of sceptical publications into the library”, p.13