Haenlein, M. (2010). "Users of the world unite! The challenges and opportunities of Social Media". Business Horizons. 53: 59–68. doi:10.1016/j.bushor.2009.09.003. S2CID16741539.
Haenlein, M. (2010). "Users of the world unite! The challenges and opportunities of Social Media". Business Horizons. 53: 59–68. doi:10.1016/j.bushor.2009.09.003. S2CID16741539.