VAN WEEGHEL, Stef. Reflections on Separate Enterprise vs. Formulary Apportionment. W: KUKULSKI, Ziemowit; SĘK, Małgorzata (red.). Challenges of Contemporary Tax Law: Jubilee Book Dedicated to Professor Włodzimierz Nykiel. Volume II. Poland: Wydawnictwo Uniwersytetu Łódzkiego,2024. p. 351–359. DOI: 10.18778/8331-399-3.28. Disponível em: https://www.press.uni.lodz.pl/index.php/wul/catalog/book/1154/chapter/3175. Acesso em: 21 sty. 2026.