@book { Personalentwicklung2020,
    title = "Personalentwicklung 2020",
    author = "Ingelore {Welpe}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-02656-6",
    url = "https://www.peterlang.com/document/1047492"
}