@book { StatistikfrWirtschaftswissenschaftler,
    title = "Statistik für Wirtschaftswissenschaftler",
    author = "Josef {Bleymüller} and Rafael {Weißbach} and Günther {Gehlert} and Herbert {Gülicher}",
    year = "2015",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1220950"
}