@book { EinreisetourismusinDeutschland,
    title = "Einreisetourismus in Deutschland",
    author = "Verena {Dexheimer}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00163-1",
    url = "https://www.peterlang.com/document/1044351"
}