@book { OutlinesofaModernCriticalEducationalScienceinGermany,
    title = "Outlines of a Modern Critical Educational Science in Germany",
    author = "Heinz-Hermann {Krüger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1104152"
}