@book { ChancenundHerausforderungenderAppVermarktunginnerhalbderLuftverkehrsbranche,
    title = "Chancen und Herausforderungen der App-Vermarktung innerhalb der Luftverkehrsbranche",
    author = "Maria del Mar {Villa André}",
    year = "2012",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783842843288",
    url = "https://m.diplom.de/document/229337"
}