Strojny, P., and A. Strojny. “Do the Aesthetics of Video Games Matter? The Influence of Classical and Expressive Aesthetics on Video Game Engagement”. Annales Universitatis Paedagogicae Cracoviensis Studia Psychologica, vol. 9, no. 1, Dec. 2016, pp. 35-41, https://studia-psychologica.uken.krakow.pl/article/view/5622.