@book { RegionalHistoriesandHistoricalRegions,
    title = "Regional Histories and Historical Regions",
    subtitle = "The Concept of the Baltic Sea Region in Polish and Swedish Historiographies",
    author = "Marta {Grzechnik}",
    year = "2012",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/978-3-653-01462-4",
    url = "https://www.peterlang.com/document/1046717"
}