Sources:
* Jaroslav Pelikan, Confessor Between East and West: A Portrait of Ukrainian Cardinal Josyf Slipyj (1990)
* Bohdan Budurowycz, "The Greek Catholic Church in Galicia, 1914-1944" (2002-2003)
* Serhii Plokhy, "Between Moscow and Rome: Struggle for the Greek Catholic Patriariachate in Ukraine" in Journal of Church and State (1995)
* Karim Schelkens, "Vatican Diplomacy after the Cuban Missile Crisis: New Light on the Release of Josyf Slipyj" in The Catholic Historical Review (2011)
* Paul Robert Magocsi, A History of Ukraine (1996)