Wiefel, Marc, and Michal Gregus. “Digitalization: The New Digital Consumer and the Change of Companies Value Chain”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 21, no. 1 (April 4, 2015): 378–388. Accessed September 14, 2025. https://www.gssrr.org/JournalOfBasicAndApplied/article/view/3635.