@book { Makrokonomie,
    title = "Makroökonomie",
    author = "Michael {Burda} and Charles {Wyplosz} and Peter {Hennecke} and Michaela {Kleber} and Angela {Lechner} and Doris {Neuberger}",
    year = "2018",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1221292"
}