@book { Appgehts,
    title = "App geht's!",
    subtitle = "Potentiale, Herausforderungen und Erfolgsfaktoren von Apps im Mobile Marketing",
    author = "Laura {Müller}",
    year = "2011",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842812949",
    url = "https://m.diplom.de/document/228452"
}