@book { InternalMigrationsinPoland,
    title = "Internal Migrations in Poland",
    author = "Łukasz {Skoczylas} and Elżbieta {Smolarkiewicz}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15472",
    url = "https://www.peterlang.com/document/1058021"
}