“Przemysław Saganek, Unilateral Acts of States in Public International Law, Brill Nijhoff, Leiden, Boston: 2015, Pp. 662 ISBN 978-90-04-27460-0”. Polish Yearbook of International Law 35 (June 30, 2016): 343–350. Accessed October 3, 2025. https://czasopisma.inp.pan.pl/index.php/pyil/article/view/2496.