Wałęga, G. 2016. How Business Models Are Changing in the Era of the Internet. Krakow Review of Economics and Management/Zeszyty Naukowe Uniwersytetu Ekonomicznego w Krakowie. 5(953) (Nov. 2016), 33–50. DOI:https://doi.org/10.15678/ZNUEK.2016.0953.0503.