@book { TherapiezufriedenheitvonDrogenabhngigen,
    title = "Therapiezufriedenheit von Drogenabhängigen",
    author = "Ralph H.U. {Wettach}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1096823"
}