@book{Piper2018,
  author    = {Piper, Ernst},
  title     = {Geschichte des Nationalsozialismus},
  publisher = {bpb, Bundeszentrale f{\"u}r politische Bildung},
  address   = {Bonn},
  isbn      = {978-3-7425-0291-9},
  pages     = {499},
  year      = {2018},
  language  = {de}
}
@phdthesis{Piper2005,
  author    = {Piper, Ernst},
  title     = {Alfred Rosenberg : Hitlers Chefideologe},
  publisher = {Blessing},
  address   = {M{\"u}nchen},
  isbn      = {3-89667-148-0},
  pages     = {830 S.},
  year      = {2005},
  language  = {de}
}
@misc{Piper2015,
  author    = {Piper, Ernst},
  title     = {Alfred Rosenberg. The Diaries of 1934-1944},
  series = {Deutsche Zeitschrift f{\"u}r Geschichtswissenschaft},
  volume    = {63},
  journal   = {Deutsche Zeitschrift f{\"u}r Geschichtswissenschaft},
  number    = {7-8},
  publisher = {Metropol-Verl.},
  address   = {Berlin},
  issn      = {0044-2828},
  pages     = {705 -- 707},
  year      = {2015},
  language  = {de}
}