@book { AutonomesELearning,
    title = "Autonomes E-Learning",
    author = "Björn {Langkopf}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15278",
    url = "https://www.peterlang.com/document/1057407"
}