@book { SchubertsWinterreise,
    title = "Schuberts Winterreise",
    subtitle = "Ein Wegweiser zum Verständnis und zur Interpretation- Die Winterreise von Wilhelm Müller und Franz Schubert",
    author = "Hans-Udo {Kreuels}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1108215"
}