@book { AuswirkungenvonEinkaufsconvenience,
    title = "Auswirkungen von Einkaufsconvenience",
    author = "Andreas {Ettinger}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00337-6",
    url = "https://www.peterlang.com/document/1054225"
}