@book { berMandalasymbolikundHeilpdagogikinderSchule,
    title = "Über Mandalasymbolik und Heilpädagogik in der Schule",
    author = "Hanns-Dietrich {Werner}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1095257"
}