@book { ContentandLanguageIntegratedLearningbyInteraction,
    title = "Content and Language Integrated Learning by Interaction",
    author = "Rita {Kupetz} and Carmen {Becker}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04725-7",
    url = "https://www.peterlang.com/document/1048221"
}