Cita APA

Pius X, P. (1904). The XIII Centenary of St. Gregory, Encyclical Letter of Pius X. New York.

Chicago Style (17th ed.) Citation

Pius X, Pope. The XIII Centenary of St. Gregory, Encyclical Letter of Pius X. New York, 1904.

Cita MLA

Pius X, Pope. The XIII Centenary of St. Gregory, Encyclical Letter of Pius X. New York, 1904.