), "The Acts of William I King of Scots 1165–1214" in "Regesta Regum Scottorum", Volume II, (Edinburgh, 1971)* idem (ed.
), "The Acts of William I King of Scots 1165-1214" en "Regesta Regum Scottorum", Volumen II, (Edimburgo, 1971)* Barrow, G. W. S.