Accounts and personal business papers of John Mackenzie, Writer to the Signet., 1770-1772., MS.1186. Correspondence and papers of the Mackenzies of Delvine and their clients., MSS.1101-1530. National Library of Scotland Archives and Manuscripts Division. https://nlssb.as.atlas-sys.com/repositories/2/archival_objects/48258 Accessed September 23, 2024.