Guitmundi de corporis et sanguis christi veritate in eucharistia / Guitmundi. - Guitmond, of Aversa, 11th cent. (OLS)http://pul/name/55371; Hurter, Hugo, S.I., 1832-1914. (OLS)http://pul/name/14162 (Libraria academica wagneriana, 1879)