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Scientific Bulletin of Chełm - Section of Pedagogy > 2021 > 1 > 181-187
Scientific Bulletin of Chełm - Section of Pedagogy > 2021 > 1 > 181-187
Marketing i Rynek > 2020 > 5 > 26-37
Ekonomia. Wrocław Economic Review > 2015 > 21 > 1 > 41 - 62