1. 1. http://code.google.com/apis/youtube/2.0/developers guide php.html #Searching for Videos.
2. 2. http://www.seo.com/blog/optimizing-ranking-videos-in-youtube-pubconreview/.
3. 3. Romanov K, Nevgi A. Do medical students watch video clips in eLearning and do these facilitate learning? Med Teach 2007;29:484–8.
4. 4. History of YouTube [Internet]. 2007 [cited 20 February 2017]. Available from: https://en.wikipedia.org/wiki/History_of_YouTube.
5. 5. Available from: http://www.sramanamitra.com/2007/08/21/Web-30-Online-Health-Part-2/Web 3.0 and Online Health, Part 2 [accessed 01.01.08].