@book { PropdeutikderUnterrichtsmethodeninderWaldorfpdagogik,
    title = "Propädeutik der Unterrichtsmethoden in der Waldorfpädagogik",
    author = "Angelika {Wiehl}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-06017-1",
    url = "https://www.peterlang.com/document/1049808"
}