@book{ij00236840, author = {Johannes XXI, Pont. Max. (formerly Petrus Hispanus)}, title = {Summulae logicales. Comm: Johannes de Magistris}, year = {9 Sept. 1490}, note = {}, publisher = {[Bonetus Locatellus], for Octavianus Scotus}, address = {Venice}, annote = { This record was exported from the Incunabula Short Title Catalogue (ISTC): http://data.cerl.org/istc/ij00236840} }