Innes, Matthew (2007) What was 'law' in the Carolingian empire? In: Anderson, P. and Münster-Swendsen, M. and Vogt, H. (eds.) Law before Gratian: law in western Europe c. 500-1100 (proceedings of the third Carlsberg Academy conference on medieval legal history 2006). Proceedings of the Carlsberg Academy Conferences on Medieval Legal History 3. Copenhagen, Denmark: DJØF Publishing (and Institute for Legal History). ISBN 9788757416473.