@book { Schulverweigerung,
    title = "Schulverweigerung",
    author = "Tobias {Engel}",
    year = "2007",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836606745",
    url = "https://m.diplom.de/document/225444"
}