@book { DiePerspektivenregionalerIntegrationimsdlichenAfrika,
    title = "Die Perspektiven regionaler Integration im südlichen Afrika",
    author = "Volker {Ressler}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1102971"
}