@book { KundenwerbenKundenProgrammeFacettenderAnreizsystemgestaltung,
    title = "Kunden-werben-Kunden-Programme – Facetten der Anreizsystemgestaltung",
    author = "Christoph {Look}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04071-5",
    url = "https://www.peterlang.com/document/1048263"
}