@book { InternationalesMarketing,
    title = "Internationales Marketing",
    author = "Joachim {Zentes} and Bernhard {Swoboda} and Hanna {Schramm-Klein}",
    year = "2013",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220898"
}