@book { CrashkursLohnundGehaltsabrechnung,
    title = "Crashkurs Lohn- und Gehaltsabrechnung",
    author = "Gerhard C. {Girlich}",
    year = "2011",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220783"
}