Catholic Church. Pope (1958-1963 : John XXIII). (1980). On recent developments of the social question in the light of Christian teaching, Mater et magistra: Encyclical letter. St. Paul Editions.
Παραπομπή σε μορφή Chicago (17η εκδ.)Catholic Church. Pope (1958-1963 : John XXIII). On Recent Developments of the Social Question in the Light of Christian Teaching, Mater Et Magistra: Encyclical Letter. Boston: St. Paul Editions, 1980.
Παραπομπή σε μορφή MLA (8th εκδ.)Catholic Church. Pope (1958-1963 : John XXIII). On Recent Developments of the Social Question in the Light of Christian Teaching, Mater Et Magistra: Encyclical Letter. St. Paul Editions, 1980.
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