APA

Iohannes Paulus PP, . (1987). Encyclical letter Sollicitudo rei socialis of the supreme pontiff John Paul II to the bishops, priests, religious families, sons and daughters of the Church and all people of good will for the twentieth anniversary of Populorum Progressio. Vatican City: Libreria Editrice Vaticana.

Chicago

Iohannes Paulus PP, . 1987. Encyclical letter Sollicitudo rei socialis of the supreme pontiff John Paul II to the bishops, priests, religious families, sons and daughters of the Church and all people of good will for the twentieth anniversary of Populorum Progressio. Vatican City: Libreria Editrice Vaticana.

Harvard

Iohannes Paulus PP, . (1987). Encyclical letter Sollicitudo rei socialis of the supreme pontiff John Paul II to the bishops, priests, religious families, sons and daughters of the Church and all people of good will for the twentieth anniversary of Populorum Progressio. Vatican City: Libreria Editrice Vaticana.

MLA

Iohannes Paulus PP, . Encyclical letter Sollicitudo rei socialis of the supreme pontiff John Paul II to the bishops, priests, religious families, sons and daughters of the Church and all people of good will for the twentieth anniversary of Populorum Progressio. Vatican City: Libreria Editrice Vaticana. 1987.