D. Cornell, "A Kingdom Cleared of Castles: the Role of the Castle in the Campaigns of Robert Bruce", The Scottish Historical Review 87 (224), pp. 233–257 (2008) JSTOR23074055doi:10.3366/E0036924108000140
D. Cornell, "A Kingdom Cleared of Castles: the Role of the Castle in the Campaigns of Robert Bruce", The Scottish Historical Review 87 (224), pp. 233–257 (2008) JSTOR23074055doi:10.3366/E0036924108000140
landmarktrust.org.uk
"Scotland". Landmark Trust. Retrieved 12 November 2013.