@book { MarketingSuccessFactors,
    title = "Marketing Success Factors",
    subtitle = "Marketing Tools and Insights from Business Psychology",
    author = "Katja {Gelbrich} and Stefan {Müller}",
    year = "2025",
    publisher = "Vahlen",
    address = "München, Deutschland",
    url = "https://vahlen.openpublishing.com/document/1592498"
}