@book { Laslenguasorales,
    title = "Las lenguas orales",
    subtitle = "Claves glosodidácticas",
    author = "Bárbara {Herrero}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/978-3-0351-0295-6",
    url = "https://www.peterlang.com/document/1052291"
}