Documents, chiefly copies, and papers in the claim to the ancient earldom of Levenax, or Lennox, drawn up about 1772-1774 (but not brought to the House of Lords) by George Cockburn Haldane of Gleneagles., MSS.20001-20003. National Library of Scotland Archives and Manuscripts Division. https://manuscripts.nls.uk/repositories/2/resources/18680 Accessed May 20, 2024.