Subject: Canon Law
Author of work: Gregorius IX
Title: Decretales
Subject: Theology
Author of work: Petrus Lombardus
Title: Sententiae
Subject: Theology
Author of work: Thomas Aquinas
Title: Expositio quarti libri Sententiarum Petri Lombardi
Subject: Theology
Author of work: Petrus Lombardus
Title: Sententiae