Catholic Church. Pope (1958-1963 : John XXIII), John XXIII, P., & Gibbons, W. J. (1962). Mater et magistra: Encyclical letter; Christianity and social progress. Paulist Press.
Chicago Style (17th ed.) CitationCatholic Church. Pope (1958-1963 : John XXIII), Pope John XXIII, and William J. Gibbons. Mater Et Magistra: Encyclical Letter; Christianity and Social Progress. [New York]: Paulist Press, 1962.
MLA (8th ed.) CitationCatholic Church. Pope (1958-1963 : John XXIII), et al. Mater Et Magistra: Encyclical Letter; Christianity and Social Progress. Paulist Press, 1962.
Warning: These citations may not always be 100% accurate.