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Quoted in Brown 1999, p. 20 Brown, George Hardin (1999). "Royal and Ecclesiastical rivalries in Bede's History". Renascence. 51 (1): 19–33. doi:10.5840/renascence19995213.
Thacker 1998, pp. 474–476 Thacker, Alan (1998). "Memorializing Gregory the Great: The Origin and Transmission of a Papal Cult in the 7th and early 8th centuries". Early Medieval Europe. 7 (1): 59–84. doi:10.1111/1468-0254.00018. S2CID161546509.