@book { FacetofaceInteraktion,
    title = "Face-to-face Interaktion",
    author = "Horst {Reiger} and Horst {Reiger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1090767"
}