1. CERL (Computer-Based Education Research Laboratory Demonstration of the PLATO IV Computer-Based Education System Final Report, University of Illinois, Urbana-Champaign, Illinois 1977
2. Macromedia, Inc., Authorware Professional for Windows, 600 Townsend St., San Francisco, CA, 94103
3. Microsoft Corporation, One Microsoft Way, Redmond, WA, 98052-6399