On the regulation of Birth : Encyclical letter of His Holiness Pope Paul VI to the Venerable Patriarchs, Archbishops and Bishops and other Local Ordinaries in peace and communion with the Apostolic See to priests, and faithful and to all men of good will /
Catholic Church.Pope (1963-1978 : Paul VI)
Rome : Vatican Polyglot P. ; London : Catholic Truth Society,
1968.