Subject: Canon Law
Author of work: Gregorius IX
Title: Decretales
Subject: Canon Law
Title: Treatise on canon law
Subject: Pastoralia
Author of work: Ricardus de Wetheringett
Title: Summa 'Qui bene presunt'
Subject: Canon Law
Author of work: Gratianus
Title: Decretum Gratiani
Subject: Philosophy
Author of work: Averroes
Title: De spmpno et vigilia, De longitudine et brevitate vitae, De generatione et corruptione
Subject: Canon Law
Author of work: Innocentius IV
Title: In Decretales