1. & (1977). Planning menus for display: Some effects of their structure on user performance. Proceedings of the International Conference on Displays for Man-Machine Systems. IEEE Publication, 150, 130-133.
2. & (2000). Searching within websites: A comparison of three types of sitemap menu structures. Proceedings of the Human Factors and Ergonomics Society 44th Annual Meeting (pp. 441-444). Santa Monica, CA: Human Factors and Ergonomics Society.
3. (1982). User perceptual mechanisms in the search of computer command menus. Proceedings of Human Factors in Computer Systems (pp. 190-196). New York: ACM Press.
4. & (2000). Bringing order to the web: Automatically categorizing search results. Proceedings of Human Factors in Computing Systems (CHI'00) (pp. 145-152). New York: ACM Press.