@book { TheConceptofModernLaw,
    title = "The Concept of Modern Law",
    subtitle = "Polish and Central European Tradition",
    author = "Michał {Peno} and Konrad {Burdziak}",
    year = "2019",
    publisher = "Peter Lang Verlag",
    address = "Berlin, Germany",
    doi = "10.3726/b15622",
    url = "https://www.peterlang.com/document/1056703"
}