@book { NeueGrohandelsbetriebslehre, title = "Neue Großhandelsbetriebslehre", author = "Martin {Creutzig}", year = "2009", publisher = "Peter Lang Verlag", address = "Berlin, Germany", doi = "10.3726/978-3-653-01121-0", url = "https://www.peterlang.com/document/1054127" }