@book{Toennissen2011,
  author    = {T{\"o}nnissen, Stefan},
  title     = {Revision der IT-Governance mit CoBiT : Leitfaden f{\"u}r die Pr{\"u}fungspraxis},
  publisher = {Erich Schmidt Verlag},
  address   = {Berlin},
  isbn      = {978-3-503-13012-2},
  publisher      = {FH M{\"u}nster - University of Applied Sciences},
  pages     = {323},
  year      = {2011},
  language  = {de}
}
@article{Toennissen2011,
  author    = {T{\"o}nnissen, Stefan},
  title     = {Die planerische Behandlung von Leerkosten bei Unterbesch{\"a}ftigung},
  series = {Controller Magazin},
  volume    = {36/2011},
  journal   = {Controller Magazin},
  issn      = {0939-0359},
  pages     = {75 -- 79},
  year      = {2011},
  language  = {de}
}
@article{Toennissen2011,
  author    = {T{\"o}nnissen, Stefan},
  title     = {Ursachen und L{\"o}sungen von St{\"o}rungen im Kommunikationsprozess des Controllers},
  series = {Controller Magazin},
  volume    = {36/2011},
  journal   = {Controller Magazin},
  issn      = {0939-0359},
  pages     = {65 -- 68},
  year      = {2011},
  language  = {de}
}
@article{Toennissen2011,
  author    = {T{\"o}nnissen, Stefan},
  title     = {Existenzgr{\"u}ndung eines Unternehmens {\"u}ber den nebenberuflichen Einstieg},
  series = {Controller Magazin},
  volume    = {36/2011},
  journal   = {Controller Magazin},
  issn      = {0939-0359},
  pages     = {55 -- 58},
  year      = {2011},
  language  = {de}
}