@book { DasDesignThinkingPlaybook,
    title = "Das Design Thinking Playbook",
    author = "Michael {Lewrick} and Patrick {Link} and Larry {Leifer} and Nadia {Langensand}",
    year = "2018",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1221290"
}