@incollection{Kocka2007,
  author    = {J{\"u}rgen Kocka},
  title     = {Einleitung},
  isbn      = {3-05-003270-7},
  url       = {http://edoc.bbaw.de/oa/series/rejlvDEACCvo/PDF/25SdImkH2aPkM_442.pdf},
  year      = {2007},
}