Bibliography:

-    F. Calasso, Introduzione al diritto comune, Milano, Giuffrè, 1970. 
-    W. H. Bryson, Dictionary of Sigla and Abbreviations to and in Law Books before 1607, Charlottesville, University Press of Virginia, 1975.
-    J. Berlioz (ed.), Identifier sources et citations, Turnhout, Brepols, 1994.
-    J. W. Cairns – P. J. du Plessis (eds.), The creation of the ius commune. From casus to regula, Edinburgh, Edinburgh University Press, 2010.