@book{MulthaupPluemer1990,
  author    = {Multhaup, Roland and Pl{\"u}mer, Thomas},
  title     = {Entsorgungslogistik},
  edition   = {1. Aufl.},
  publisher = {Verl. T{\"U}V Rheinland},
  address   = {K{\"o}ln},
  isbn      = {3-88585-831-2},
  pages     = {206 S. : Ill., graph. Darst.},
  year      = {1990},
  language  = {de}
}
@book{MulthaupSchengber2003,
  author    = {Multhaup, Roland and Schengber, Ralf},
  title     = {Internetauftritte deutscher St{\"a}dte},
  volume    = {31},
  edition   = {1. Aufl.},
  publisher = {Fachhochsch.},
  address   = {M{\"u}nster},
  pages     = {58 Bl. : Ill., graph. Darst.},
  year      = {2003},
  language  = {de}
}
@book{Multhaup2005,
  author    = {Multhaup, Roland},
  title     = {Marketingaktivit{\"a}ten deutscher Krankenh{\"a}user},
  year      = {2005},
  language  = {mul}
}