@book { SuchmaschinenmarketingmitGoogle,
    title = "Suchmaschinenmarketing mit Google",
    author = "Sebastian {Günther}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836609685",
    url = "https://m.diplom.de/document/225588"
}