Barrett, James H. "The Norse in Scotland" in Brink, Stefan (ed) (2008) The Viking World. Abingdon. Routledge. Coventry, Martin (2008) Castles of the Clans. Musselburgh. Goblinshead.
Barrett, James H. "The Norse in Scotland" in Brink, Stefan (ed) (2008) The Viking World Abingdon. Routledge. Coventry, Martin (2008) Castles of the Clans Musselburgh. Goblinshead.