@book { GesichterAfrikasEinKontinentinPortrts,
    title = "Gesichter Afrikas - Ein Kontinent in Porträts",
    author = "Wolfgang {Gieler}",
    year = "2022",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b19427",
    url = "https://www.peterlang.com/document/1214475"
}