APA
John Paul II, . (1991). Centesimus Annus : Encyclical letter of the Supreme Pontiff John Paul II on the hundredth anniversary of rerum novarum. Vatican: Libreria Editrice Vaticana.
Chicago
John Paul II, . 1991. Centesimus Annus : Encyclical letter of the Supreme Pontiff John Paul II on the hundredth anniversary of rerum novarum. Vatican: Libreria Editrice Vaticana.
Harvard
John Paul II, . (1991). Centesimus Annus : Encyclical letter of the Supreme Pontiff John Paul II on the hundredth anniversary of rerum novarum. Vatican: Libreria Editrice Vaticana.
MLA
John Paul II, . Centesimus Annus : Encyclical letter of the Supreme Pontiff John Paul II on the hundredth anniversary of rerum novarum. Vatican: Libreria Editrice Vaticana. 1991.
