@book { DasZisterzienserinnenklosterFraubrunnen,
    title = "Das Zisterzienserinnenkloster Fraubrunnen",
    author = "Jürg {Leuzinger}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1104232"
}