Burke, Sir John Bernard, Genealogical and Heraldic History of the Peerage Baronetage and Knightage. 99th edition. London: Burke's Peerage, 1949. Available at http://archive.org/details/burkesgenealogic1949unse. Information from this source tagged as [Ref: Burke Peerage [cx0-9]*].
Sources for birth and parent Information
parents:
John STEWART & dau Thomas KEYRIELL [Ref: Burke Peerage p1929]
Sources with Information about marriage to (Unk) HUMERSTON
names:
Thomas STEWART & dau John HUMERSTON [Ref: Burke Peerage p1929],