APA (7th ed.) Citation

(1903). The Great Encyclical Letters of Pope Leo xiii. Benziger brothers.

Chicago Style (17th ed.) Citation

The Great Encyclical Letters of Pope Leo Xiii. New york: Benziger brothers, 1903.

MLA (9th ed.) Citation

The Great Encyclical Letters of Pope Leo Xiii. Benziger brothers, 1903.

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