@book { SinFronteras,
    title = "Sin Fronteras?",
    author = "Lena {Berger} and Irene {Kögl} and Julia {Reiter} and Frauke {Schmidt} and Michael {Vogler}",
    year = "2021",
    publisher = "Meidenbauer",
    address = ", Germany",
    url = "https://www.peterlang.com/document/1104150"
}