@book { BerufsorientierungeinSystem,
    title = "Berufsorientierung – ein System",
    author = "Lothar {Beinke}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02225-4",
    url = "https://www.peterlang.com/document/1046984"
}