Fr. Rogeri Marston O.F.M. Quodlibeta quatuor ad fidem codicum / nunc primum edita studio et cura Girardi F. Etzkorn et Ignatii C. Brady. - Marston, Roger, O.F.M., m.c. 1303. (OLS)http://pul/name/16681; Brady, Ignatius Charles, O.F.M. (OLS)http://pul/name/23347; Etzkorn, Girard J., O.F.M. (OLS)http://pul/name/7995 (ex typografia Collegii S. Bonaventurae, 1968)