@book { Lenguasencontactoayeryhoy,
    title = "Lenguas en contacto, ayer y hoy",
    author = "Santiago {del Rey Quesada} and Jaime {González Gómez} and Florencio {del Barrio de la Rosa}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15393",
    url = "https://www.peterlang.com/document/1110784"
}