@book { LapolitiquelinguistiqueauCamerounde18841960,
    title = "La politique linguistique au Cameroun de 1884-1960",
    author = "Rudolf {Stumpf}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1070688"
}