author = { Droysen, Johann Gustav Hübner, Rudolf },

title = { Briefwechsel },

publisher = {Biblio-Verl.},

year = {19XX-},

booktitle = {Deutsche Geschichtsquellen des 19. Jahrhunderts ; .},

address = { Osnabrück },

url = { http://slubdd.de/katalog?TN_libero_mab2 }