@book { StaatenlexikonAmerika,
    title = "Staatenlexikon Amerika",
    author = "Wolfgang {Gieler} and Markus {Porsche-Ludwig}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b14759",
    url = "https://www.peterlang.com/document/1054532"
}