@book { TextsorteninderLiteratur,
    title = "Textsorten in der Literatur",
    subtitle = "Eine Studie zu Gedichten des «Kondor»",
    author = "Michael {Schecker}",
    year = "1977",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1070014"
}