PIECZONKA, Piotr. Principles of interpretation of collective agreements within the meaning of Art. 9 of the Labor Code and other labor law agreements. Studia Iuridica Toruniensia. Online. 15 March 2023. Vol. 31, no. 2, pp. 311-333. [Accessed 29 June 2024]. DOI 10.12775/SIT.2022.039.