@book { ProduktmarketingfrdigitaleTextinhaltebeiBuchverlagen,
    title = "Produktmarketing für digitale Textinhalte bei Buchverlagen",
    subtitle = "Eine strategische Konzeption",
    author = "Martin {Bardeleben}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836630429",
    url = "https://m.diplom.de/document/226841"
}