@book { VerwandtschaftundGesellschaftimaltenChina,
    title = "Verwandtschaft und Gesellschaft im alten China",
    author = "Robert {Gassmann}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1100676"
}