Hunt 2004. Hunt, William (2004). «Petrus (St Petrus) (d. 605x11)». In: Brooks, N. P. (revisor). Oxford Dictionary of National Biography. Oxford: Oxford University Press. doi:10.1093/ref:odnb/15176
Wood 1994, p. 7. Wood, Ian (janeiro de 1994). «The Mission of Augustine of Canterbury to the English». Speculum. 69 (1): 1–17. doi:10.2307/2864782