Subject: Canon Law
Author of work: Gratianus
Title: Decretum Gratiani
Subject: Philosophy
Title: Scholastic philosophy
Subject: Philosophy
Author of work: Aristoteles
Title: Analytica posteriora
Subject: Theology
Author of work: Gregorius I
Title: Moralia
Subject: Canon Law
Title: Commentary on Decretals
Subject: Liturgy
Title: Missale