APA
John XXIII P., . (1963). Encyclical letter of His Holiness Pope John XXIII "Peace on Earth. Pacem in Terris" : addressed to all mankind. Boston: St. Paul Editions.
Chicago
John XXIII Pope, . 1963. Encyclical letter of His Holiness Pope John XXIII "Peace on Earth. Pacem in Terris" : addressed to all mankind. Boston: St. Paul Editions.
Harvard
John XXIII P., . (1963). Encyclical letter of His Holiness Pope John XXIII "Peace on Earth. Pacem in Terris" : addressed to all mankind. Boston: St. Paul Editions.
MLA
John XXIII Pope, . Encyclical letter of His Holiness Pope John XXIII "Peace on Earth. Pacem in Terris" : addressed to all mankind. Boston: St. Paul Editions. 1963.
