@book { MontessoriPdagogik,
    title = "Montessori-Pädagogik",
    author = "Egon {Hansen} and Charlotte {Kühn}",
    year = "2023",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/1345312"
}