1. Internet World stats. (2019) Total number of websites. http://www.internetlivestats.com/total-number-of-websites.
2. Netcraft Ltd. (May 2019) How many active sites are there? https://news.netcraft.com/archives/2019/05/10/may-2019-web-server-survey.html.
3. S. Cimino and F. Micali, “Web q-model: A new approach to the quality,” in Proceedings of the 26th Annual CHI Conference on Human Factors in Computing Systems, 2008, florence, Italy.
4. S. Murugesan, “Web application development: Challenges and the role of web engineering,” in WebEngineering: Modelling and Implementing Web Applications, G. Rossi, O. Pastor, D. Schwabe, and L. Olsina, Eds. London: Springer, 2008, pp. 7–32.
5. H. Sørum, R. Medaglia, and K. Andersen, “Assessment of website quality: Scandinavian web awards right on track?” in Proceedings of the 8th International Conference on Electronic Government, Linz, Austria, August 31 - September 3. Springer Berlin, Heidelberg, 2009, pp. 198–209.