Hughes 1863. Hughes, William (1863), The geography of British history, Oxford University: Longman, Green, Longman, Roberts, & Green, p. 22, archived from the original on 19 May 2016, retrieved 25 September 2016
Hughes 1863. Hughes, William (1863), The geography of British history, Oxford University: Longman, Green, Longman, Roberts, & Green, p. 22, archived from the original on 19 May 2016, retrieved 25 September 2016