Columbia subject headings:
Harvard subject headings:
Abner, of Burgos, approximately 1270-
Abner, of Burgos, approximately 1270---Contributions in apologetics.
Apologetics--Early works to 1800
Apologetics--History--Middle Ages, 600-1500
Catholic Church--Doctrines.
Llull, Ramon, 1232?-1316
Llull, Ramon, 1232?-1316--Contributions in apologetics.
Peter Pascual, Saint, -1300--Contributions in apologetics.
Peter Pascual, Saint, -1300.
Princeton subject headings:
Apologetics--History--Middle Ages, 600-1500.
Catholic Church--Doctrines--Catholic authors.
Folk literature--Portugal--History and criticism.
Folk literature--Spain--History and criticism.