@article{Wala,
  author    = {Wala, Thomas},
  title     = {Die betriebswirtschaftliche Klausur: Kostenmanagement.},
  series = {WISU},
  journal   = {WISU},
  number    = {6},
  pages     = {686 -- 688},
  subject      = {Kostenmanagement},
  language  = {de}
}
@book{WalaHaslehnerHirsch,
  author    = {Wala, Thomas and Haslehner, Franz and Hirsch, Manuela},
  title     = {Kostenrechnung, Budgetierung und Kostenmanagement},
  publisher = {Linde},
  address   = {Wien},
  isbn      = {9783714303117},
  publisher      = {Fachhochschule Technikum Wien},
  subject      = {Kostenrechnung},
  language  = {de}
}
@article{WalaFelleitnerGoll,
  author    = {Wala, Thomas and Felleitner-Goll, Katharina},
  title     = {Die betriebswirtschaftliche Klausur: Kostenmanagement.},
  series = {WISU},
  journal   = {WISU},
  number    = {1},
  pages     = {74 -- 76},
  subject      = {Kostenmanagement},
  language  = {de}
}