Tompkins, P. (2016). Proof of angels: The definitive book on the reality of angels and the surprising role they play in each of our lives (First [edition].). Howard Books.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Tompkins, Ptolemy. Proof of Angels: The Definitive Book on the Reality of Angels and the Surprising Role They Play in Each of Our Lives. First [edition]. New York: Howard Books, 2016.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Tompkins, Ptolemy. Proof of Angels: The Definitive Book on the Reality of Angels and the Surprising Role They Play in Each of Our Lives. First [edition]. Howard Books, 2016.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.