@book { VariationinLanguageandLanguageUse,
    title = "Variation in Language and Language Use",
    author = "Monika {Reif} and Justyna {Robinson} and Martin {Pütz}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02301-5",
    url = "https://www.peterlang.com/document/1047427"
}