@book {Valois1880, title = {De arte scribendi epistolas apud Galicos medii aevi scriptores rhetoresque}, series = {Bibliothequede l{\textquoteright}Ecole de Chartres}, number = {22}, year = {1880}, note = {
преизд. New York s.d
}, publisher = {A. Picard}, organization = {A. Picard}, address = {Paris}, author = {Valois, No{\"e}l} }