Various. Harper's Young People, December 23, 1879 An Illustrated Weekly.
Chicago-referens (17:e uppl.)Various. Harper's Young People, December 23, 1879 An Illustrated Weekly.
MLA-referens (9:e uppl.)Various. Harper's Young People, December 23, 1879 An Illustrated Weekly.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.