Duraj, T. (red.) (2024) „Introduction into the international research project “In Search of a Legal Model of Self-Employment in Poland A Comparative Legal Analysis” – part II”, w In Search of a Legal Model of Self-Employment in Poland: A Comparative Legal Analysis. Part II. Poland: Wydawnictwo Uniwersytetu Łódzkiego (Prawo), s. 7–9. doi:10.18778/8331-526-3.01.