@book { EthnicityandLanguageVariation,
    title = "Ethnicity and Language Variation",
    subtitle = "Grammar and Code-switching in the Afrikaans Speech Community",
    author = "Gerald {Stell}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1108382"
}