“…A mix of bibliometric and manual content analysis tools has been used for the analysis. Bibliometric analysis is a quantitative method that provides deep insight into the literature (De Bellis, 2009;Benckendorff and Zehrer, 2013) and helps the scientist to build new knowledge (Dabic et al, 2014;Dabic, González-Loureiro and Harvey, 2015; Gonzalez-Loureiro, M., Dabic and Furrer, 2015;López-Duarte et al, 2016;Gonzalez-Loureiro et al, 2017). While content analysis is a method of analyzing selected papers and derive a synthesis (Duriau, Reger and Pfarrer, 2007;Khoo, Jin-Cheon and Jaidka, 2011;Seuring and Gold, 2012).…”