APA

Paulus PP, . (1967). Encyclical letter of his holiness Paul VI pope to the bishops, priests, religious, the faithful and to all men of good will on the development of peoples. [Vatican City]: Vatican Polyglot Press.

Chicago

Paulus PP, . 1967. Encyclical letter of his holiness Paul VI pope to the bishops, priests, religious, the faithful and to all men of good will on the development of peoples. [Vatican City]: Vatican Polyglot Press.

Harvard

Paulus PP, . (1967). Encyclical letter of his holiness Paul VI pope to the bishops, priests, religious, the faithful and to all men of good will on the development of peoples. [Vatican City]: Vatican Polyglot Press.

MLA

Paulus PP, . Encyclical letter of his holiness Paul VI pope to the bishops, priests, religious, the faithful and to all men of good will on the development of peoples. [Vatican City]: Vatican Polyglot Press. 1967.