Comprehension, Coherence and Strategies in Hypertext and Linear Text

By Peter W. Foltz. The features in hypertext supply flexibility to the reader when compared to reading linear text such as books. The concept of using the associative paths in hypertext to retrieve and read information has caused great excitement.
http://www-psych.nmsu.edu/~pfoltz/reprints/Ht-Cognition.html

Network Learning Environments and Hypertext

By Michael J. Jacobson and James A. Levinas. Researchers and educators begin to consider the more widespread utilization of network-mediated resources, the very richness of these resources imposes special logistical and cognitive demands on the user that
http://www.ed.uiuc.edu/tta/Papers/J&L-Tel-Ed93.html