@book { DerGeschichtsunterrichtanWaldorfschulen,
    title = "Der Geschichtsunterricht an Waldorfschulen",
    author = "Markus Michael {Zech}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01520-1",
    url = "https://www.peterlang.com/document/1047316"
}