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.
तो हम पाएँगे कि ये किताबें अच्छी स्लावोनियाई भाषा इस्तेमाल करने की काबिलीयत का सबसे बढ़िया सबूत हैं ।