@book { InternetundAltwerden,
    title = "Internet und Altwerden",
    author = "Marie-Louise {Rendant}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02089-2",
    url = "https://www.peterlang.com/document/1046025"
}