found: Library of Congress Manuscript Division for John Glassford and Company records, 1753-1844(John Campbell)
found: Tobacco Lords, 1990:p. 178 (John Campbell; son of Alexander Campbell, captain in Black Watch and scion of Highland landed family; matriculated, University of Glasgow; owner of Glasgow firm involved in West Indian cotton and sugar trade; shareholder in John Glassford and Company; purchased Morriston estate in Lanarkshire in 1796)
found: The Scots magazine, May 1808:p. 399 (deaths: April; 25. At Glasgow, in the 74th year of his age, John Campbell, sen., Esq.)