Machnik- Słomka, J., and I. Kłosok- Bazan. “The Problem of Environmental Awareness in Terms of The Eco-Innovation Implementation in Enterprises”. Economic and Environmental Studies, vol. 17, no. 2 (42), Nov. 2020, pp. 221-34, https://czasopisma.uni.opole.pl/index.php/ees/article/view/2684.