Khursheed, Bridget (2001): Invisible learning in online systems. The Changing Universities - The Role of Technology, The 7th International Conference of European University Information Systems. Bonn: Gesellschaft für Informatik e.V.. PISSN: 1617-5468. ISBN: 3-88579-339-3. pp. 463-469. Regular Research Papers. Berlin. March 28-30, 2001
