@book { Elespaolysusintaxis,
    title = "El español y su sintaxis",
    author = "Silvia {Burunat} and Ángel L. {Estévez} and Aleksín H. {Ortega}",
    year = "1987",
    publisher = "Peter Lang Verlag",
    address = "New York, United States of America",
    doi = "10.3726/978-1-4539-0069-7",
    url = "https://www.peterlang.com/document/1054361"
}