@book { FhrungundErziehung,
    title = "Führung und Erziehung",
    author = "Michael {Fleißer}",
    year = "2006",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832496937",
    url = "https://m.diplom.de/document/224769"
}