@book{Grunwald2012, author = {Guido Grunwald}, title = {Angewandte Marktforschung : eine praxisorientierte Einf{\"u}hrung}, publisher = {Oldenbourg}, address = {M{\"u}nchen}, isbn = {978-3-486-71338-1}, pages = {162}, year = {2012}, language = {de} }