Mari, L. M. e Picciaia, F. (2014) «The accounting methods of the “Opera del Duomo” of Orvieto, from its origins to the 16th century statute reform: single or double-entry bookkeeping?», De Computis, Revista Española de Historia de la Contabilidad, 11(21), pagg. 49–72. doi: 10.26784/issn.1886-1881.v11i21.38.