@book{kochbuch,
  title     = {Mathematik für das Ingenieurstudium},
  author    = {Koch, Jürgen},
  editor    = {Stämpfle, Martin},
  address   = {München},
  publisher = {Hanser},
  year      = {2018},
  edition   = {4., aktualisierte Auflage},
  isbn      = {9783446451667},
  doi       = {10.3139/9783446455818},
}

@article{...