Gaya APA

II, J, P. (1995). Encyclical letter 'Ut unum sint' of the Holy Father John Paul II on commitment to ecumenism. . Vatican City: Vatican City Libreria Editrice Vaticana.

Gaya MLA

II, Joannes, Paulus. "Encyclical letter 'Ut unum sint' of the Holy Father John Paul II on commitment to ecumenism. ". Vatican City: Vatican City Libreria Editrice Vaticana, 1995. Buku.