Search for: [Source = "Knowledge, economy, society. Challenges and development trends of modern economy, finance and information technology. Ed. by Anna Malina, Renata Oczkowska, Jarosław Kaczmarek. Cracow University of Economics. Faculty of Management, Foundation of the Cracow University of Economics. Cracow \: Foundation of the Cracow University of Economics, 2015, s. 439\-450"]