Ref. is to Thomas Crawford, "Burns: A Study of the Poems and Songs" (Edinburgh-London: Oliver & Boyd, 1960), p. 239. He goes on to to say that the song is "in character", as sung by an opponent of the Union of Parliamjents in 1707, "and it shows Burns working in the spirit of his source-material to produce an imaginative reconstruction of a patriot's feelings in 1707", etc. He doesn't go much into what "source material" there might be. I should add maybe that the editor of B's complete poems, James Kinsley (Oxford, 1968), notes that in the MS. it's labelled "Mr B---- words", BUT in the Scots Musical Museum is left unsigned, "perhaps because the theme and the refrain were not Burns's own".