@book{Graf2018,
  author    = {Graf, Hans-Werner},
  title     = {Wirtschaftsinformatik I},
  publisher = {epubli},
  address   = {Berlin},
  isbn      = {978-3-7467-6451-1},
  pages     = {III, 183},
  year      = {2018},
  language  = {de}
}