ANDRZEJ BUDA, ANDRZEJ JARYNOWSKI, and KATARZYNA KUŹMICZ. “An Attempt to Unified Approach to the Evolution of Products in the Entertainment Industry”. E-methodology 6, no. 6 (May 28, 2020): 80-93. Accessed January 17, 2021. https://e-methodology.eu/index.php/e-methodology/article/view/1196.