@book { BeeinflussungstendenzenbeiKopfnoten,
    title = "Beeinflussungstendenzen bei Kopfnoten",
    author = "Johanna {Hausmann}",
    year = "2010",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836647144",
    url = "https://m.diplom.de/document/227801"
}