APA (7th ed.) Citation

Leo XIII, P. C. C. P. (1878). Sanctissimi Domini Nostri Leonis Divina Providentia Papae XIII, Epistola Encyclica. Rome.

Chicago Style (17th ed.) Citation

Leo XIII, Pope; Catholic Church. Pope. Sanctissimi Domini Nostri Leonis Divina Providentia Papae XIII, Epistola Encyclica. Rome, 1878.

MLA (8th ed.) Citation

Leo XIII, Pope; Catholic Church. Pope. Sanctissimi Domini Nostri Leonis Divina Providentia Papae XIII, Epistola Encyclica. Rome, 1878.

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