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 | Catholic Encyclopedia: Sts. Cyril and Methodius - Also called Constantine and Methodius. Biography of these ninth-century brothers, Apostles of the Slavs.
|  | Catholic Online: Sts. Cyril and Methodius - Reflection on their lives.
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 | Cyril and Methodius, Missionaries to the Slavs - Outline of their missionary activities. With prayer in traditional and contemporary language.
|  | Cyril and Methodius, Saints - Short note on the fathers of Slavonic literature, in the Columbia Encyclopedia.
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 | Cyril, Monk, and Methodius B - Illustrated biography of SS. Cyril and Methodius.
|  | Grande Munus - Encyclical of Pope Leo XIII, on SS. Cyril and Methodius, promulgated in 1880.
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 | Lives of the Saints: SS Cyril and Methodius - From Alban Butler's Lives of the Saints.
|  | Slavorum Apostoli - Commemoration of the Eleventh Centenary of the Evangelizing Work of SS. Cyril and Methodius. Encyclical of Pope John Paul II, promulgated in 1985.
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 | St. Cyril and St. Methodius - The story of these two brothers, suitable for children. Preformatted line breaks can make this difficult to read.
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