@book { Styleinsyntax,
    title = "Style in syntax",
    subtitle = "Investigating variation in Spanish pronoun subjects",
    author = "Miguel Ángel {Aijón Oliva} and Maria José {Serrano Montesinos}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/978-3-0351-0448-6",
    url = "https://www.peterlang.com/document/1052879"
}