@book{Poetzsch, author = {Poetzsch, Eleonore}, title = {Wirtschaftsinformation}, edition = {2., v{\"o}llig neu bearb. u. erw. Aufl.}, publisher = {Verl. f{\"u}r Berlin-Brandenburg}, address = {Potsdam}, isbn = {3-935035-58-6}, pages = {370}, subject = {Wirtschaftsinformation}, language = {de} } @book{Kmuche, author = {Kmuche, Wolfgang}, title = {Umgang mit externen Datenbanken}, edition = {4. v{\"o}llig {\"u}berarb. und erw.}, publisher = {WRS}, address = {Landshut}, isbn = {3-8092-0939-2}, pages = {169}, subject = {Datenbank}, language = {de} }