^McLean, Iain; McMillan, Alistair (2005). State of the Union: Unionism and the Alternatives in the United Kingdom since 1707. Oxford University Press. ISBN 0-19-925820-1. Retrieved 6 January 2008.
^ abRoss, David (2002). Chronology of Scottish History. New Lanark: Geddes & Grosset. ISBN 1-85534-380-0.