@book { Diccionarioyaprendizajedelespaol,
    title = "Diccionario y aprendizaje del español",
    author = "Stefan {Ruhstaller} and Maria Dolores {Gordón Perral}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1135998"
}