@book { DasKnigreichWrttembergimErstenWeltkrieg,
    title = "Das Königreich Württemberg im Ersten Weltkrieg",
    author = "Hans {Wicki}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1070840"
}