@book { Laienwerbung,
    title = "Laienwerbung",
    author = "Steffen {Burrer}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04887-2",
    url = "https://www.peterlang.com/document/1048757"
}