@book { PowerfoodfrKinderundJugendliche,
    title = "Powerfood für Kinder und Jugendliche",
    author = "Holger {Kiefer}",
    year = "2023",
    publisher = "Heil-Weg-Verlag",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/1381829"
}