@book { StrategischeMarketingplanungamBeispielDrOetker,
    title = "Strategische Marketingplanung am Beispiel Dr. Oetker",
    author = "",
    year = "2022",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/1239146"
}