Armstrong, W. (1988). Catholic doctrine playing cards: Key principles and basic facts of faith for school religion classes, C.C.D. programs and family instruction to children. The Author.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Armstrong, William. Catholic Doctrine Playing Cards: Key Principles and Basic Facts of Faith for School Religion Classes, C.C.D. Programs and Family Instruction to Children. Tacoma, Wash.: The Author, 1988.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Armstrong, William. Catholic Doctrine Playing Cards: Key Principles and Basic Facts of Faith for School Religion Classes, C.C.D. Programs and Family Instruction to Children. The Author, 1988.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.