Cita APA (7a ed.)

Juan XXIII. (1961). Mater et magistra: Christianity and social progress. The America.

Cita Chicago Style (17a ed.)

Juan XXIII. Mater Et Magistra: Christianity and Social Progress. Nueva York: The America, 1961.

Cita MLA (9a ed.)

Juan XXIII. Mater Et Magistra: Christianity and Social Progress. The America, 1961.