Catholic Church. Pope (1958-1963 : John XXIII) & John XXIII, P. (1961). Encyclical letter of His Holiness John XXIII ... on recent developments of the social question in the light of Christian teaching =: Mater et magistra. St. Paul Editions.

Catholic Church. Pope (1958-1963 : John XXIII) and Pope John XXIII. Encyclical Letter of His Holiness John XXIII ... on Recent Developments of the Social Question in the Light of Christian Teaching =: Mater Et Magistra. Boston: St. Paul Editions, 1961.

Catholic Church. Pope (1958-1963 : John XXIII) and Pope John XXIII. Encyclical Letter of His Holiness John XXIII ... on Recent Developments of the Social Question in the Light of Christian Teaching =: Mater Et Magistra. St. Paul Editions, 1961.