Sipa, Monika, and Andrzej Skibiński. “Selected Aspects of Age Management As a Challenge for Polish Entrepreneurs”. Journal of Education and Vocational Research 7, no. 1 (April 15, 2016): 21–28. Accessed October 25, 2026. https://amhinternational.com/jevr/article/view/4547-selected-aspects-of-age-management-as-a-challenge-for-polish-entrepreneurs.