@book { DieSchweizerRegimenterinNeapelim18Jahrhundert17341789,
    title = "Die Schweizer Regimenter in Neapel im 18. Jahrhundert (1734-1789)",
    author = "Robert-Peter {Eyer}",
    year = "2021",
    publisher = "Peter Lang Verlag",
    address = "Lausanne, Switzerland",
    url = "https://www.peterlang.com/document/1105865"
}