↑ O'Gorman, Frank(1997).The Long Eighteenth Century: British Political and Social History 1688–1832 (The Arnold History of Britain Series).A Hodder Arnold Publication.ISBN978-0-340-56751-7.OCLC243883533
↑ Marshall, P. J. (Editor)(2001).The Oxford History of the British Empire: Volume II: The Eighteenth Century (Oxford History of the British Empire).Oxford University Press, USA.ISBN978-0-19-924677-9.OCLC174866045, "Introduction" by P. J. Marshall, page 1