Information Architecture for the World Wide Web
by L. Rosenfled & P. Morville
O'Reilly & Associates, 1998

Interactivity by Design:
Creating and Communication with New Media

R. Kristof & A. Satran
Hayden Books, 1995

Web Site Usability: A Designer's Guide
J. Spool, T. Scanlon, W. Schroeder
Morgan Kaufmann Publishers, Inc., 1999

Handbook of Usability Testing
J. Rubin
John Wiley & Sons, 1994