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European Journal of Management Issues > 2017 > 25 > 3-4 > 154-161
European Journal of Management Issues > 2017 > 25 > 1 > 30-35
ΣΟΦΙΑ. Pismo Filozofów Krajów Słowiańskich > 2015 > 15 > 97-111
Handel Wewnętrzny > 2017 > 3 (368) Tom II > 81-89