Gervase, abbot of prémontré : a medieval letter-writter - Cheney, Christopher Robert 1906-1987 (Manchester The librarian, the John Rylands Library [etc.], 1950)
Es tirada aparte de: "Bulletin of the John Rylands Library", vol. 33, n. 1, september 1950
Keywords: Gervasio, Abad de Prémontré -- m. 1228