@book{MarquardtMauMayerMikelskis1993,
  author    = {Marquardt-Mau, Brunhilde and Mayer, J{\"u}rgen and Mikelskis, Helmut},
  title     = {Umwelt : Lexikon {\"o}kologisches Grundwissen},
  volume    = {6337},
  publisher = {Rowohlt},
  address   = {Reinbek bei Hamburg},
  isbn      = {3-499-16337-3},
  pages     = {509 S.},
  year      = {1993},
  language  = {de}
}
@book{MarquardtMauMayerMikelskis1995,
  author    = {Marquardt-Mau, Brunhilde and Mayer, J{\"u}rgen and Mikelskis, Helmut},
  title     = {Umwelt : Lexikon der Grundbegriffe ; {\"o}kologisches Grundwissen ; f{\"u}r Windows},
  publisher = {Systhema; Systhema-Verl.},
  address   = {M{\"u}nchen},
  isbn      = {3-634-22123-2},
  pages     = {3 Disketten},
  year      = {1995},
  language  = {de}
}