@book { ThecontributionofNGOstointernationalconflictresolution,
    title = "The contribution of NGOs to international conflict resolution",
    author = "Tilman {Pradt}",
    year = "2012",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    url = "https://m.diplom.de/document/229197"
}