@book { ArbeitfrDoofesparenInExcel2019und365,
    title = "Arbeit für Doofe sparen: In Excel 2019 und 365",
    author = "Ina {Koys}",
    year = "2019",
    publisher = "Computertrainerin.de",
    address = ", Deutschland",
    url = "https://tolino.openpublishing.com/document/995987"
}