Subject: Theology
Author of work: Petrus Lombardus
Title: In Psalmos
Subject: Canon Law
Title: Commentary on Decretum Gratiani
Subject: Theology
Title: Theology
Subject: Canon Law
Author of work: Gregorius IX
Title: Decretales
Subject: Science
Author of work: Alhazen
Title: Optica
Subject: Civil Law
Author of work: Justinianus
Title: Digestum
Subject: Liturgy
Title: Lectionarium
Subject: Theology
Author of work: Petrus Lombardus
Title: Sententiae; Theology
Subject: Theology
Author of work: Thomas Aquinas
Title: Expositio quarti libri Sententiarum Petri Lombardi
Subject: Biblica
Title: Comment. on Genesis