APA (7th ed.) Citation

Joan XXIII, p., & Campion, D. R. E. K. C. (1961). Mater et Magistra: Christianity and Social Progress. The American Press.

Chicago Style (17th ed.) Citation

Joan XXIII, papa, and Donald R.and E. K. Culhane Campion. Mater Et Magistra: Christianity and Social Progress. New York: The American Press, 1961.

MLA (9th ed.) Citation

Joan XXIII, papa, and Donald R.and E. K. Culhane Campion. Mater Et Magistra: Christianity and Social Progress. The American Press, 1961.