@book { TheUSforeignpolicyaftertheColdWar,
    title = "The US foreign policy after the Cold War ",
    author = "Norman {Mach}",
    year = "2011",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    doi = "10.3239/9783640953714",
    url = "https://www.hausarbeiten.de/document/174715"
}