Johnston, George Harvey. "The Earls of Douglas." The Heraldry of the Douglases: ...

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Johnston, George Harvey. "The Earls of Douglas." The Heraldry of the Douglases: With Notes on All the Males of the Family, Descriptions of the Arms, Plates and Pedigrees. Edinburgh: W. & A.K. Johnston, Limited, 1907. pp. 13-15 available online.

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