@book{LittkemannKlausKlaus2019,
  author    = {J{\"o}rn Littkemann and Derfuß Klaus and Schulte Klaus},
  title     = {{\"U}bungen zum Controlling, Band 2},
  editor    = {J{\"o}rn Littkemann},
  isbn      = {978-3-7431-6555-7},
  year      = {2019},
}