@book { ImmanuelWallersteinDasmoderneWeltsystem,
    title = "Immanuel Wallerstein - Das moderne Weltsystem",
    author = "Felix {Hoffmann}",
    year = "2008",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640146840",
    url = "https://www.hausarbeiten.de/document/113897"
}