@book { IBMSPSSSyntax,
    title = "IBM SPSS Syntax",
    author = "Marko {Sarstedt} and Tobias {Schütz} and Sascha {Raithel}",
    year = "2018",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1221307"
}