RICHARDS, Diana, and Andrei DECU. “SOCIAL COOPERATION WITHIN VIRTUAL WORLDS. OLD SOCIAL PHENOMENA EMERGING IN NEW ENVIRONMENTS”. Studia Universitatis Babeș-Bolyai Philosophia, vol. 62, no. 1, Apr. 2017, pp. 23 – 48, doi:10.24193/subbphil.2017.1.02.