KOWALIK, Kamila. The SWOT-TOWS analysis as a tool of the PDCA cycle in improving the quality of the postal service. Journal of Education, Health and Sport. Online. 30 June 2020. Vol. 10, no. 6, pp. 296-308. [Accessed 18 July 2024]. DOI 10.12775/JEHS.2020.10.06.032.