@book { KeyAccountManagementbeiDienstleistern, title = "Key-Account-Management bei Dienstleistern", author = "Giovanna {Gasperetti}", year = "2000", publisher = "Diplom.de", address = "Hamburg, Deutschland", doi = "10.3239/9783832421533", url = "https://m.diplom.de/document/217984" }