APA (7th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), National Catholic Welfare Conference, & Pius XI, P. (1964). Mens nostra: On the promotion of the practice of spiritual exercises : encyclical letter of Pope Pius XI. National Catholic Welfare Conference.

Chicago Style (17th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), National Catholic Welfare Conference, and Pope Pius XI. Mens Nostra: On the Promotion of the Practice of Spiritual Exercises : Encyclical Letter of Pope Pius XI. Washington, D.C.: National Catholic Welfare Conference, 1964.

MLA (8th ed.) Citation

Catholic Church. Pope (1922-1939 : Pius XI), et al. Mens Nostra: On the Promotion of the Practice of Spiritual Exercises : Encyclical Letter of Pope Pius XI. National Catholic Welfare Conference, 1964.