@book { ChallengesofDifferentiationinaPrimaryCLILClassroom,
    title = "Challenges of Differentiation in a Primary CLIL Classroom",
    author = "Eugen {Gusser}",
    year = "2018",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/454063"
}