@book { SelbsterfllbarkeitvonRatings,
    title = "Selbsterfüllbarkeit von Ratings",
    author = "Sanela {Celjo-Hörhager}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1106939"
}