(1940). Key of heaven: A manual of prayers and instructions for Catholics, in accordance with recent pontifical decrees. Catholic Book Pub. Co..
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Key of Heaven: A Manual of Prayers and Instructions for Catholics, in Accordance with Recent Pontifical Decrees. New York: Catholic Book Pub. Co., 1940.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Key of Heaven: A Manual of Prayers and Instructions for Catholics, in Accordance with Recent Pontifical Decrees. Catholic Book Pub. Co., 1940.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.