Џон Китс — разлика између измена

* {{Cite book |ref= harv|last=Meigs|first=William Montgomery|title=The Life of John Caldwell Calhoun|url=http://books.google.com/books?id=5ZdTh_GcPEYC|year=1917|publisher=The Neale Publishing Company|pages=277|ref=harv}}