- Author: Pope Gregory I, Edmund G. Gardner (editor)
- Language: English
- Year: 1911
- Author: Pope Gregory I, David Hurst
- Language: English
- Year: 2009
- Author: Pope Gregory VII, H. E. J. Cowdrey
- Language: Latin, English
- Year: 1972
- Author: Pope Gregory I
- Language: English
- Year: 2009
- Author: Pope Gregory I, Edward Van Speybrouck
- Language: English
- Year: 1995
- Author: Pope Gregory I, Straw Carole Ellen
- Language: English
- Year: 1988
- Author: Pope Gregory VII
- Language: Latin
- Year: 1878