Catholic Church. Pope (1958-1963 : John XXIII) & Gibbons, W. J. (1961). Mater et magistra: Encyclical letter of His Holiness Pope John XXIII: Christianity and social progress. Paulist Press.
Lua i Stíl Chicago (17ú heag.)Catholic Church. Pope (1958-1963 : John XXIII) agus William J. Gibbons. Mater Et Magistra: Encyclical Letter of His Holiness Pope John XXIII: Christianity and Social Progress. New York: Paulist Press, 1961.
Lua MLA (8ú heag.)Catholic Church. Pope (1958-1963 : John XXIII) agus William J. Gibbons. Mater Et Magistra: Encyclical Letter of His Holiness Pope John XXIII: Christianity and Social Progress. Paulist Press, 1961.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.