Catholic Church. Leo XIII, P. (1889). Sanctissimi Domini nostri Leonis Divina Providentia Papae XIII. Epistola de Magno Lycaeo Catholico Foederatorum Americae Septentrionalis Statuum in urbe Washington Constituto. Rome.
Chicago Style (17th ed.) CitationCatholic Church. Leo XIII, Pope. Sanctissimi Domini Nostri Leonis Divina Providentia Papae XIII. Epistola De Magno Lycaeo Catholico Foederatorum Americae Septentrionalis Statuum in Urbe Washington Constituto. Rome, 1889.
MLA (8th ed.) CitationCatholic Church. Leo XIII, Pope. Sanctissimi Domini Nostri Leonis Divina Providentia Papae XIII. Epistola De Magno Lycaeo Catholico Foederatorum Americae Septentrionalis Statuum in Urbe Washington Constituto. Rome, 1889.
Warning: These citations may not always be 100% accurate.