@book { DasGeistlicheLiedimOstseeraum,
    title = "Das Geistliche Lied im Ostseeraum",
    author = "Ekkehard {Ochs} and Walter {Werbeck} and Lutz {Winkler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1097068"
}