@book { TheUnitedStatesasaDividedNation,
    title = "The United States as a Divided Nation",
    author = "Marcin {Grabowski} and Krystof {Kozák} and György {Tóth}",
    year = "2014",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-04189-7",
    url = "https://www.peterlang.com/document/1048400"
}