Ulrico de Estrasburgo

Fagin, Charles Joseph, The doctrine of the Divine Ideas in the "Summa de Bono" of Ulrich of Strasbourg: Text and philosophical introduction (1948)

http://www.archive.org/details/doctrineofdivine00fagiuoft

Lescoe, Francis Joseph, The theory of the first principle in the Summa de Bono of Ulrich of Strasbourg: a philosophical study and text (Thesis, Ph.D., 1949)

http://www.archive.org/details/theoryoffirstpri00lescuoft

Collingwood, Francis Joseph, Theory of being in Summa de Bono, (Book II) of Ulrich of Strasbourg: Philosophical study and text (Thesis, Ph.D., 1952)

http://www.archive.org/details/theoryofbeingins00colluoft