Moreover, the book The Cambridge Medieval History states: “It is easy to imagine that [Cyril] had others to help him, who must have been in the first instance people of native Slav origin with a Greek education.
केम्ब्रिज मेडिव्हल हिस्ट्री हे पुस्तक देखील हेच म्हणते: “[सिरिल] यांना बहुधा इतरांनीसुद्धा मदत केली असावी.