@book { AlldeutscheindenUSA,
    title = "Alldeutsche in den USA",
    subtitle = "Die New Yorker Ortsgruppe im frühen 20. Jahrhundert ",
    author = "Markus {Bierkoch}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15109",
    url = "https://www.peterlang.com/document/1110871"
}