@book { DieBetriebsleiterprsenzindenGesundheitshandwerken,
    title = "Die Betriebsleiterpräsenz in den Gesundheitshandwerken",
    author = "Eric {Zimmermann}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15528",
    url = "https://www.peterlang.com/document/1057970"
}