Analysis of information sources in references of the Wikipedia article "Battle of Stirling (1648)" in English language version.
Quoting: "In 1845 the Chief of Clan MacTavish, Sheriff Dugald MACTAVISH of Dunardry wrote "twenty one generations from father to son without an instance of collateral or female succession" National Library and Archives of Canada: Hargrave-MacTavish Papers, Letter by Sheriff Dugald MacTavish of Dunardry, dated Kilchrist, 18 Feb. 1845.