@book { DigitalbusinessmodelanalysisBusinesstransformationandpracticalexample,
    title = "Digital business model analysis. Business transformation and practical example",
    author = "Vjollca {Berisha}",
    year = "2021",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/1030180"
}