Abels, Richard (2009). "The Historiography of a Construct: 'Feudalism' and the Medieval Historian". History Compass. 7 (3): 1018. doi:10.1111/j.1478-0542.2009.00610.x#ss4-title (inactive 2024-08-27).{{cite journal}}: CS1 maint: DOI inactive as of August 2024 (link)