Roger Bacon : the problem of universals in his philosophical commentaries - Crowley, Theodore (O.F.M.) (Manchester The librarian, the John Rylands library Manchester University Press, 1952)
Separata de: Bulletin of the John Rylands Library, vol. 34, n? 2, March, 1952
Keywords: Bacon, Roger -- (O.F.M.) -- 1214?-1294