@book { DerEinsatzdesInternetsimGeographieunterricht,
    title = "Der Einsatz des Internets im Geographieunterricht",
    author = "Stefan {Padberg}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1136328"
}