• Petersons.com
  Created by the people who put out the Peterson's college guides.
• The companion web site for The Distance Learner's Guide developed by the Western Cooperative for Educational Telecommunications; George Connick, Editor (Prentice Hall). This site contains nearly 1,000 providers of distance education.
• The Council for Adult and Experiential Learning (CAEL) provides information on assessment of prior learning, resources in distance and experiential education, and links to other useful sites.

Reference books that may be helpful include:

• The Electronic University: A Guide to Distance Learning Programs (NUCEA with Peterson's Guides)
• The Independent Study Catalog (NUCEA with Peterson's Guides)
• The Adult Learner's Guide to Alternative and External Degrees in the Information Age (Oryx Press)
• External Degrees in the Information Age by Henry A. Spille, David W. Stewart, and Eugene Sullivan (Oryx Press)
• Thorson's Guide to Campus-Free College Degrees (Thorson's Guide)