1. 1. Sergey Brin and Lawrence Page, “The Anatomy of a Large-Scale Hypertextual Web Search Engine,”. [Online].Available: http://infolab.stanford.edu/~backrub/google.html
   2. Meng Cui, Songyun Hu, “Search Engine Optimization Research For Website Promotion, Transport Management College, Dalian Maritime University, Dalian, 116026, China”. [Online]. Available: http://www.ftsm.ukm.my:8080/kt/attachme nts/article/69/06113701.pdf
   3. Joeran Beel, Bela Gipp, Erik Wilde. UC Berkeley School o f Information.” Academic Search Engine Optimization (ASEO): Optimizing Scholarly Literature for Google Scholar & Co.”[Online].Available: http://www.beel.org/files/papers/2010-ASEO-- preprint.pdf
   4. "10 SEO Techniques All Top Web Sites Should Use".[Online].Available:http://freelancefolder.com/10-topseo-techniques/.
   5. “Search Engine Optimization”. [Online]. Available: http://en.wikipedia.org/wiki/Search_engine_optimiza tion.
   6. “Ultimate Benefits of SEO”.[Online]. Available: http://www.nextsbd.com/seo/benefits-of-seo.php