@book { KooperationenvonHandelsunternehmen,
    title = "Kooperationen von Handelsunternehmen",
    author = "Philipp {Siebelt}",
    year = "2010",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-00382-6",
    url = "https://www.peterlang.com/document/1054298"
}