@book { EntrepreneurialOrientationvonGrndern,
    title = "Entrepreneurial Orientation von Gründern",
    author = "Alexander {Hausen}",
    year = "2010",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640708352",
    url = "https://www.hausarbeiten.de/document/157825"
}