@book { bungenzurFinanzwirtschaftderUnternehmung,
    title = "Übungen zur Finanzwirtschaft der Unternehmung",
    author = "Martin {Schulz} and Andreas {Rathgeber} and Stefan {Stöckl} and Marc {Wagner}",
    year = "2017",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1221036"
}