@book { VerhandelnwieeinProfi,
    title = "Verhandeln wie ein Profi",
    subtitle = "Wie Sie in jeder Situation überzeugen",
    author = "Scott {Walker}",
    year = "2025",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1683681"
}