A. R. Pires and S. M. Loureiro, "A study on antecedents and impacts of engagement and participation in brand communities in Portugal 2013", in Conf. book Proc. of 6th EuroMed Conf. of the EuroMed Academy of Business Research- Confronting Contemporary Business Challenges through Management Innovation, Demetris Vrontis, Yaakov Weber and Shlomo Tarba, Ed., EuroMed Press, 2013, pp. 1820-1836