Mater et magistra, encyclical letter; Christianity and social progress. - Catholic church. Pope, 1958 (Joannes XXIII); Gibbons, William Joseph 1912. (Glen Rock, N. J. Paulist Press, 1962)
"Teaching-aid outline, by William J. Bertsch and William J. Gibbons": p. 83-90.
Keywords: Church and social problems -- Catholic church -- Papal documents