@book { Laestructuradelespaol,
    title = "La estructura del español",
    author = "Silvia {Burunat} and Ángel L. {Estévez} and Carlos {Riobó}",
    year = "2020",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/b15193",
    url = "https://www.peterlang.com/document/1056670"
}