@book { DigitalizationofEducationTheHowandWhyofLifelongLearning,
    title = "Digitalization of Education – The How and Why of Lifelong Learning",
    author = "Lars {Rettig}",
    year = "2018",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14339",
    url = "https://www.peterlang.com/document/1056554"
}