@book { DasDramaimDeutschunterrichtum1900,
    title = "Das Drama im Deutschunterricht um 1900",
    author = "Helge C. {Liebsch}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b16363",
    url = "https://www.peterlang.com/document/1057674"
}