@book { LnergieauCamerounauXXesicle,
    title = "L’énergie au Cameroun au XXe siècle",
    author = "Williams {Pokam Kamdem}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Bruxelles, Belgium",
    doi = "10.3726/b18374",
    url = "https://www.peterlang.com/document/1114399"
}