^ abRoss, David (2002). Chronology of Scottish History. New Lanark: Geddes & Grosset. ISBN 1-85534-380-0.
^Paxton, R.; Shipway, J. (2007). Scotland: Lowlands and Borders. Civil Engineering Heritage. London: Thomas Telford for the Institution of Civil Engineers. ISBN 978-0-7277-3487-7.