reference
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- http://www.rampantscotland.com/ragman/blragman_r.htm
- Beverage, A., n.d. Clydesdale: Descriptive, Historical and Romantic, p. 50 (en)
- Ritchie, R. L. G., The Normans in Scotland. Edinburgh: University Press, 1954 (en)
- Familysearch (en)
- Black, G. Surnames of Scotland, Edinburgh: Birlinn, 1999 (en)
- Reid, T. History of the Parish of Crawfordjohn, Upper Ward of Lanarkshire 1153 to 1928. Edinburgh: Turnball & Spiers, 1928 (en)
- Sinclair, J. Statistical Accounts of Scotland 1791 - 99; Vol. 2, p. 210 (en)
- Grant, ‘A Lordship and Society in 12th Century Clydesdale’ in Pryce et al. Power and Identity in the Middle Ages: Essays in Memory of Rees Davies. Oxford: Oxford University Press, 2007 (en)
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