Ruthenian Greek Catholic Church (English Wikipedia)

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"Acta Sanctae Sedis" (PDF). 24. S. Congr. de Propaganda Fide. 1891–92: 390–391. {{cite journal}}: Cite journal requires |journal= (help)
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Andrew Jackson Shipman (1913). "Ruthenians" . In Herbermann, Charles (ed.). Catholic Encyclopedia. New York: Robert Appleton Company.