Pius X, P. (1904). The XIII Centenary of St. Gregory, Encyclical Letter of Pius X. New York.
Chicago Style (17th ed.) CitationPius X, Pope. The XIII Centenary of St. Gregory, Encyclical Letter of Pius X. New York, 1904.
MLA引文Pius X, Pope. The XIII Centenary of St. Gregory, Encyclical Letter of Pius X. New York, 1904.
警告:这些引文格式不一定是100%准确.