@book{Essl,
  author    = {Essl, G{\"u}nter},
  title     = {Worauf Berater achten. Handbuch f{\"u}r Unternehmensberatung},
  publisher = {Linde},
  publisher      = {Fachhochschule Technikum Wien},
  subject      = {Consulting},
  language  = {de}
}
@book{Lehner,
  author    = {Lehner, Martin},
  title     = {Viel Stoff - wenig Zeit. Wege aus der Vollst{\"a}ndigkeitsfalle},
  publisher      = {Fachhochschule Technikum Wien},
  subject      = {Teaching},
  language  = {de}
}