@book { BecomingMultilingual,
    title = "Becoming Multilingual",
    author = "Konrad {Bergmeister} and Cecilia {Varcasia}",
    year = "2011",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    doi = "10.3726/978-3-0351-0253-6",
    url = "https://www.peterlang.com/document/1052401"
}