@book { TheimplementationoftheSouthernAfricanDevelopmentCommunitySADCProtocolonTrade,
    title = "The implementation of the Southern African Development Community (SADC) Protocol on Trade",
    author = "Stefan Ulrich {Hegner}",
    year = "1998",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783832409258",
    url = "https://m.diplom.de/document/216825"
}