APA (7th ed.) Citation

Johannes, X. (1971). Litterae encyclicae "Mater et magistra" et "Pacem in terris". Typ. polygl. Vaticanis.

Chicago Style (17th ed.) Citation

Johannes, XXIII. Litterae Encyclicae "Mater Et Magistra" Et "Pacem in Terris". [Citta del Vaticano]: Typ. polygl. Vaticanis, 1971.

MLA (9th ed.) Citation

Johannes, XXIII. Litterae Encyclicae "Mater Et Magistra" Et "Pacem in Terris". Typ. polygl. Vaticanis, 1971.

Warning: These citations may not always be 100% accurate.