* "Five Texts on the Mediaeval Problem of Universals: Porphyry, Boethius, Abelard, Duns Scotus, Ockham" (1994), Paul Vincent Spade (ed., transl.
* "Five Texts on the Mediaeval Problem of Universals: Porphyry, Boethius, Abelard, Duns Scotus, Ockham" (1994), Paul Vincent Spade (ed., transl.