The Bobby Burns is another one of those cocktails upon which my library disagrees. I suspect your library is no different. Why even the CocktailDB gives us three versions! Anyway, since we're waddling and all why not use the Penguin's recipe?
2 oz scotch
1 oz sweet vermouth
0.25 oz Benedictine
Stir; Strain; Up
It is a little Rob Roy-ish isn't it?