Villot, J. (1978). Letter of Jean Cardinal Villot and Address of Terence Cardinal Cooke on the Occasion of a Symposium on Natural Family Planning: Ten Years of Progress - 1968-1978. Washington, D.C..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Villot, Jean. Letter of Jean Cardinal Villot and Address of Terence Cardinal Cooke on the Occasion of a Symposium on Natural Family Planning: Ten Years of Progress - 1968-1978. Washington, D.C., 1978.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Villot, Jean. Letter of Jean Cardinal Villot and Address of Terence Cardinal Cooke on the Occasion of a Symposium on Natural Family Planning: Ten Years of Progress - 1968-1978. Washington, D.C., 1978.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.