Cita APA (7a ed.)

Pius X, P. (1903). The First Encyclical Letter of Our Holy Father, Pope Pius X. New York.

Cita Chicago Style (17a ed.)

Pius X, Pope. The First Encyclical Letter of Our Holy Father, Pope Pius X. New York, 1903.

Cita MLA (8a ed.)

Pius X, Pope. The First Encyclical Letter of Our Holy Father, Pope Pius X. New York, 1903.