@book { VulkaneGletscherweitesLand,
    title = "Vulkane, Gletscher, weites Land",
    author = "Volker {Friebel}",
    year = "2018",
    publisher = "via tolino media",
    address = "München, Deutschland",
    url = "https://tolino.openpublishing.com/document/999266"
}