APA (7th ed.) Citation

John XXIII, P. (1963). On doing penance during Lent. National Catholic Welfare Conference.

Chicago Style (17th ed.) Citation

John XXIII, Pope. On Doing Penance During Lent. Washington, D.C.: National Catholic Welfare Conference, 1963.

MLA (8th ed.) Citation

John XXIII, Pope. On Doing Penance During Lent. National Catholic Welfare Conference, 1963.

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