@book { Geomarketing,
    title = "Geomarketing",
    subtitle = "Eine Analyse der Erfolgspotenziale aus Sicht der deutschen Automobilhersteller",
    author = "Benjamin {Trespe}",
    year = "2007",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1102903"
}