Cita APA (7a ed.)

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.

Cita Chicago Style (17a ed.)

Catholic Church. Pope (1958-1963 : John XXIII) y William J. Gibbons. Mater Et Magistra: Encyclical Letter of His Holiness Pope John XXIII: Christianity and Social Progress. New York: Paulist Press, 1961.

Cita MLA (8a ed.)

Catholic Church. Pope (1958-1963 : John XXIII) y William J. Gibbons. Mater Et Magistra: Encyclical Letter of His Holiness Pope John XXIII: Christianity and Social Progress. Paulist Press, 1961.