5Hill, J. R. , Hannafin, M.J. Cognitive Strategies and Learning from the World Web Wide ETR&D. Vol. 45, No. 4,1997:37-64.
6Gayle, V. D., Shorter, L., Jordan, K., and Rasmussen, K. L. ,Learning Strategies and Navigation Decisions of Children using a Hypermedia Lesson. Journal of Educational Multimedia and Hypermedia. Vo18,No2,1999:175-186.
7Marchionini, G. Hypermedia and learning.. Freedom and chaoes Educational Technology 1988 ,November, 8-12.
