1. Act from 13 September 2016. Act on Maintaining Order and Cleanliness in Municipalities. Journal of Laws No. 132, item 622. https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=wdu19961320622 (in Polish).
2. Act from 14 December 2012. Waste Act. Journal of Laws 2013, item 21. https://isap.sejm.gov.pl/isap.nsf/DocDetails.xsp?id=wdu20130000021 (in Polish).
3. Al Sharif, R., & Pokharel, S. (2022). Smart City Dimensions and Associated Risks. Review of literature. Sustainable Cities and Society, 77, 103542. https://doi.org/10.1016/j.scs.2021.103542
4. Aquanet. (2022, May). EKO. Dlaczego należy oszczędzać wodę? https://www.aquanet.pl/strefa-wiedzy/eko/ (in Polish).
5. Badam. (2022, February 6). Struktura demograficzna Poznania. https://badam.poznan.pl/2021/i_my-i-nasze-zycie/09_demografia/struktura-demograficzna-poznania-2-2/ (in Polish).