@book { SpektrumNordVielfaltderZieleInhalteundMethodeninderLandeskunde,
    title = "Spektrum Nord: Vielfalt der Ziele, Inhalte und Methoden in der Landeskunde",
    author = "Klaus {Geyer} and Frank Thomas {Grub}",
    year = "2017",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b11848",
    url = "https://www.peterlang.com/document/1067772"
}