Note 257:2 — Chapter XII · SPREAD OF THE CHRISTIAN CHURCH OVER EUROPE
Reading edition
The best collection of sources is Stritter, Memoriæ populorum olim ad Danubium, etc., Petropoli, 1771, 4 vols.; Karmasin, Hist. of Rus.; Mouravieff, Hist. of the Ch. of Rus., Oxf., 1862; Stanley, Lects. on the E. Ch., ix.-xii., Lond., 1862.