@book { DasDesignThinkingToolbook,
    title = "Das Design Thinking Toolbook",
    author = "Michael {Lewrick} and Patrick {Link} and Larry {Leifer} and Achim {Schmidt}",
    year = "2019",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1190390"
}