@book { VorundNachteilederHierarchie,
    title = "Vor- und Nachteile der Hierarchie",
    author = "Birgit {Schuler}",
    year = "1997",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832403270",
    url = "https://m.diplom.de/document/216310"
}