@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{Wala,
  author    = {Wala, Thomas},
  title     = {Die betriebswirtschaftliche Klausur: Kostenrechnung.},
  series = {WISU},
  journal   = {WISU},
  number    = {6, 2021},
  pages     = {681 -- 684},
  subject      = {Betriebswirtschaftslehre},
  language  = {de}
}