==liên kết ngoài==*the spohr society of great britain* the spohr society of the united states* werke von louis spohr im verlag dohr köln*the spohr  museum in kassel germany*the german louis spohr website (links)*spohr titles spohr as author from archiveorg*spohr titles spohr as author from booksgooglecom* spohr titles from gallica*spohr titles 1 det kongelige bibliotek denmark*spohr titles from the munich digitisation centre (mdz)* spohr titles from the university of rochester