Siudek, Tomasz, and Aldona Zawojska. “COMPETITIVENESS IN THE ECONOMIC CONCEPTS, THEORIES AND EMPIRICAL RESEARCH”. Acta Scientiarum Polonorum. Oeconomia 13, no. 1 (March 30, 2014): 91–108. Accessed April 12, 2025. https://aspe.sggw.edu.pl/article/view/511.