@book { DasKreuzfahrerfrstentumGalila,
    title = "Das Kreuzfahrerfürstentum Galiläa",
    author = "Martin {Rheinheimer}",
    year = "1990",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    url = "https://www.peterlang.com/document/1077855"
}