Cita APA

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

Citación estilo Chicago

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.

Warning: These citations may not always be 100% accurate.