American Sunday-School Union. (1830). A help to the gospels: Containing a harmony, exercises, illustrations and practical lessons (2d ed.). American Sunday-School Union.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)American Sunday-School Union. A Help to the Gospels: Containing a Harmony, Exercises, Illustrations and Practical Lessons. 2d ed. Philadelphia: American Sunday-School Union, 1830.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)American Sunday-School Union. A Help to the Gospels: Containing a Harmony, Exercises, Illustrations and Practical Lessons. 2d ed. American Sunday-School Union, 1830.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.