APA

Catholic Church, . (1961). Meter et magistra: christianity and social progress; encyclical letter of Pope John XXIII. Washington: National Catholic Welfare Conference.

Chicago

Catholic Church, . 1961. Meter et magistra: christianity and social progress; encyclical letter of Pope John XXIII. Washington: National Catholic Welfare Conference.

Harvard

Catholic Church, . (1961). Meter et magistra: christianity and social progress; encyclical letter of Pope John XXIII. Washington: National Catholic Welfare Conference.

MLA

Catholic Church, . Meter et magistra: christianity and social progress; encyclical letter of Pope John XXIII. Washington: National Catholic Welfare Conference. 1961.