Marquis de Ruvigny et Raineval, The Jacobite peerage, baronetage, knightage, and grants of honour, extracted, by permission, from the Stuart papers now in possession of his Majesty the King at Windsor Castle, and supplemented by biographical and genealogical notes (2003 reprint), p. 88
Sir Bernard Burke, A genealogical history of the dormant, abeyant, forfeited, and extinct peerages of the British empire (1866), p. 345
'H. H. Brown, Esq.' (obituary), in The Law Times dated 3 November 1866, p. 17
Prebble 2000, p. 371 states that MacDonell invented the cap. However, "Glengarry Cap - Diced --- Scots Connection". Retrieved 1 February 2009. states that the idea came from Balmoral bonnet wearers who bent and creased their bonnets, then was popularised by MacDonell when he raised the Glengarry Fencibles and made the Glengarry bonnet part of their uniform. Prebble, John (2000). The King's Jaunt. Edinburgh: Birlinn Limited. ISBN1-84158-068-6.