@book { DerEntrepreneurunddieunternehmerischenHandlungsfelder,
    title = "Der Entrepreneur und die unternehmerischen Handlungsfelder",
    author = "Detlef {Wehling}",
    year = "2015",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-03716-6",
    url = "https://www.peterlang.com/document/1047612"
}