@book { SelbstreguliertesLernenundInternet,
    title = "Selbstreguliertes Lernen und Internet",
    author = "Karin {Ziegler} and Franz {Hofmann} and Hermann {Astleitner}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1096045"
}