@book { ProduktMarktStrategiennachAnsoff,
    title = "Produkt-Markt-Strategien nach Ansoff",
    author = "Christian {Bach}",
    year = "2009",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640362615",
    url = "https://www.hausarbeiten.de/document/130374"
}