Kopyś, T. (2012). The policy of John Paul II towards the churches behind the Iron Curtain in the second half of the 20th century. The Pontifical University of John Paul II in Krakow.

Kopyś, Tadeusz. The Policy of John Paul II Towards the Churches Behind the Iron Curtain in the Second Half of the 20th Century. The Pontifical University of John Paul II in Krakow, 2012.

Kopyś, Tadeusz. The Policy of John Paul II Towards the Churches Behind the Iron Curtain in the Second Half of the 20th Century. The Pontifical University of John Paul II in Krakow, 2012.