American Sunday-School Union. (1830). A help to the gospels: Containing a harmony, exercises, illustrations and practical lessons (2d ed.). American Sunday-School Union.
Chicago-referens (17:e uppl.)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.
MLA-referens (8:e uppl.)American Sunday-School Union. A Help to the Gospels: Containing a Harmony, Exercises, Illustrations and Practical Lessons. 2d ed. American Sunday-School Union, 1830.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.