@book { TheoriederAuenwirtschaft,
    title = "Theorie der Außenwirtschaft",
    author = "Klaus {Rose} and Karlhans {Sauernheimer}",
    year = "2015",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220810"
}