@book { VariationinLanguage,
    title = "Variation in Language",
    author = "Marta {Dąbrowska}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03196-6",
    url = "https://www.peterlang.com/document/1047817"
}