@book { DerCTestAktuelleTendenzenTheCTestCurrentTrends,
    title = "Der C-Test: Aktuelle Tendenzen / The C-Test: Current Trends",
    author = "Rüdiger {Grotjahn}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04578-9",
    url = "https://www.peterlang.com/document/1048683"
}