@book { OnlineMarketinginderErnhrungswirtschaft, title = "Online-Marketing in der Ernährungswirtschaft", author = "Claudia {Schröder}", year = "2001", publisher = "Diplom.de", address = "Hamburg, Deutschland", doi = "10.3239/9783832434946", url = "https://m.diplom.de/document/219159" }