@book { EarlyBilingualismGrowingupwithtwolanguages,
    title = "Early Bilingualism. Growing up with two languages",
    author = "Anika {Kehl}",
    year = "2014",
    publisher = "GRIN Verlag",
    address = "München, Germany",
    url = "https://www.hausarbeiten.de/document/279061"
}