Missal of S. Gottardo, Milan; La tradition manuscrite du missel ambrosien / Amiet, Robert in: Scriptorium (14) 1960 Nr. 1 p. 49
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Data retrieved from USUARIUM: A Digital Library and Database for the Study of Latin Liturgical History in the Middle Ages and Early Modern Period (http://usuarium.elte.hu) built by Miklós István Földváry et al. at Eötvös Loránd University (Budapest, Hungary), Research Group of Liturgical History—from 2015 onwards.