@book { EinheitinderVielfalt,
    title = "Einheit in der Vielfalt",
    subtitle = "Festschrift für Peter Lang zum 60. Geburtstag",
    author = "Gisela {Quast}",
    year = "1988",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1073893"
}