@book { Toilettengraffiti,
    title = "Toilettengraffiti",
    author = "Christiane {Stumpf}",
    year = "2013",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01976-6",
    url = "https://www.peterlang.com/document/1046253"
}