1. Asia Today (2013). Coffee expo Seoul 2013 to provide hub for Korea’s booming coffee market. 5 February 2013, Retrieved from 21.02.14.
2. Social media ROI: Managing and measuring social media efforts in your organization;Blanchard,2011
3. Etherington, D. (2013, July 26). Mobile payment at U.S. Starbucks locations crosses 10% as more stores get wireless charging [Web log post]. Retrieved from 2.24.14.
4. Euromonitor. (2011). Global coffee trends: Finding the premiumisation opportunity. July 2011.
5. IBM. (2012). Search date 05.14.2012.