Catholic Church. Pontificia Commissio de Spirituali Migratorum atque Itinerantium Cura & United States Catholic Conference. (1978). Letter to episcopal conferences on the Church and people on the move: May 4, 1978. United States Catholic Conference.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Catholic Church. Pontificia Commissio de Spirituali Migratorum atque Itinerantium Cura و United States Catholic Conference. Letter to Episcopal Conferences on the Church and People on the Move: May 4, 1978. Washington: United States Catholic Conference, 1978.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Catholic Church. Pontificia Commissio de Spirituali Migratorum atque Itinerantium Cura و United States Catholic Conference. Letter to Episcopal Conferences on the Church and People on the Move: May 4, 1978. United States Catholic Conference, 1978.