@book { EntspannteKinderlernenbesser,
    title = "Entspannte Kinder lernen besser",
    author = "Sabine {Seyffert}",
    year = "2011",
    publisher = "humboldt",
    address = "Hannover, Deutschland",
    url = "https://schluetersche.openpublishing.com/document/403352"
}