Incipiunt decreta et consultationes Alexandri pape tercii Lisbon, Biblioteca nacional, Alcobaça CCCXIV/144, fol. 1v Collectio alcobacensis prima  C.R. Cheney and Mary G. Cheney, edd. Studies in the Collections of Twelfth-Century Decretals from Papers of the late Walter Holzmann (Monumenta iuris canonici, Series B: Corpus collectionum, 3. Cittàdel Vaticano: Biblioteca Apostolica Vaticano, 1979) 8-25. Charles Duggan, "Decretal Collections from Gratian's Decretum to the Compilationes antiquae:  The Making of the New Case Law," The History of Canon Law in the Classical Period, 1140-1234: From Gratian to the Decretals of Pope Gregory IX (History of Medieval Canon Law; Washington, D.C.: The Catholic University of America Press, 2008) 246-292 at 262-265.