@book { GeoSocialBusinessEineMglichkeitderstreuverlustfreienZielgruppenansprache,
    title = "Geo Social Business: Eine Möglichkeit der streuverlustfreien Zielgruppenansprache",
    author = "Michael {Wolf}",
    year = "2013",
    publisher = "BACHELOR + MASTER PUBLISHING",
    address = "Hamburg, Deutschland",
    url = "https://m.bachelor-master-publishing.de/document/296510"
}