ZHAO, Zhegmai The effects of visible link-types on learning in the hypertext enviroment : an empirical study - New York, EUA - 353-370 - 1994 10, nos. 3-4 = COMPUTER IN THE SCHOOLS : THE INTERDISCIPLINARY JOURNAL OF PRACTICE, THEORY, AND APPLIED RESEARCH Encabezamiento--Término de Indización: HIPERTEXTO RECUPERACION DE INFORMACION