Hammond, Matthew H., "The Durward family in the thirteenth century", in Steve Boardman and Alasdair Ross (eds. ), The Exercise of Power in Medieval Scotland, c.1200–1500'', (Dublin/Portland, 2003).
Hammond, Matthew H., "The Durward family in the thirteenth century", in Steve Boardman and Alasdair Ross (eds.), The Exercise of Power in Medieval Scotland, c.1200–1500'', (Dublin/Portland, 2003).