@book { GeschichtederostdeutschenMusiktherapie,
    title = "Geschichte der ostdeutschen Musiktherapie",
    author = "Petra {Jürgens}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1103222"
}