Johnston, George Harvey, "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, 1907)
Lee, Sidney, ed,"Dictionary of National Biography", (London, Smith Elder & Co., 1888), Vol. XV
Paul, James Balfour. "The Scots peerage: founded on Wood's ed. of Sir Robert Douglas's Peerage of Scotland; containing an historical and genealogical account of the nobility of that kingdom" (Edinburgh,,1904) Vol. I
Paul, James Balfour. "The Scots peerage: founded on Wood's ed. of Sir Robert Douglas's Peerage of Scotland; containing an historical and genealogical account of the nobility of that kingdom" (Edinburgh, David Douglas,,1908) Vol. V