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Zdroje:
[1] Media consumption increase due to the coronavirus worldwide 2020, by country.
[2] Consuming media at home due to the coronavirus worldwide 2020, by country
[3] Device usage increase due to the coronavirus worldwide 2020, by country
[4] E-commerce purchase frequency change due to the coronavirus outbreak 2020, by country
[5] E-commerce: weekly growth trend in revenue in Europe January to March 2020
[6] Online retail: daily order trends during the Coronavirus pandemic in Europe 2020
[7] Shifting to online purchases because of the COVID-19 pandemic 2020, by category