1. Apple Inc® [Internet]. Apple reports second quarter results. c2010 [cited 2009 Apr 22]. Available from: http://www.apple.com/pr/library/2009/04/22results.html.
2. iPhone users rise 161% in a year, but android chasing fast;Shields,2010
3. Invention of the year: the iPhone;Grossman,2007
4. Voalte.com [Internet]. Florida. c2010 [cited 2010 July 18]. Available at: http://www.voalte.com.
5. Amcom Software [Internet]. Minnesota. c2010 [cited 2010 July 18] Available at: http://www.amcomsoftware.com.