@book { SekundarschulweseninderRepublikSenegal,
    title = "Sekundarschulwesen in der Republik Senegal",
    author = " {Anonym}",
    year = "1980",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1072043"
}