@book { StressfreieVorschuljahre,
    title = "Stressfreie Vorschuljahre",
    author = "Doris {Heueck-Mauß}",
    year = "2014",
    publisher = "Schlütersche Verlagsgesellschaft mbH & Co. KG",
    address = ", Deutschland",
    url = "https://schluetersche.openpublishing.com/document/404156"
}