Valociková, C. and Velencei, J. 2020. How Did Reciprocity Evolve in Online Communication? Turnout of Reciprocal Altruism. Theory, Methodology, Practice - Review of Business and Management. 16, 02 (Dec. 2020), 103–113. DOI:https://doi.org/10.18096/TMP.2020.02.11.