@article{BalderjahnWill1998,
  author    = {Balderjahn, Ingo and Will, Simone},
  title     = {Laddering: Messung und Analyse von Means-End Chains},
  year      = {1998},
  language  = {de}
}
@article{BalderjahnWill1997,
  author    = {Balderjahn, Ingo and Will, Simone},
  title     = {Umweltvertr{\"a}gliches Konsumentenverhalten : Wege aus einem sozialen Dilemma},
  year      = {1997},
  language  = {de}
}