Byer, G. C. J. (1999). Charlemagne and baptism: A study of responses to the circular letter of 811/812. International Scholars Publications.
Chicago-referens (17:e uppl.)Byer, Glenn C. J. Charlemagne and Baptism: A Study of Responses to the Circular Letter of 811/812. San Francisco: International Scholars Publications, 1999.
MLA-referens (8:e uppl.)Byer, Glenn C. J. Charlemagne and Baptism: A Study of Responses to the Circular Letter of 811/812. International Scholars Publications, 1999.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.