@book { StrategischeAllianzenimLuftverkehr,
    title = "Strategische Allianzen im Luftverkehr",
    author = "Linda {Schölkmann}",
    year = "2009",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836633864",
    url = "https://m.diplom.de/document/227099"
}