Encyclicals of Paul VI Vol 2 On evangelization in the modern world - Evangelii Nuntiandi 1975|On the development of peoples - Populorum Progressio 1967|Priestly celibacy - Sacerdotalis Caelibatus 1967|On the regulation of birth - Humanae Vitae 1968|On the renewal of the religious lif - Paul VI (London|Washington Catholic Truth Society|United States Catholic Conference, various dates .)