Collis, B. (1996). Tele-learning in a digital world: The future of distance learning. International Thomson Computer Press.
Chicago-viite (17. p.)Collis, Betty. Tele-learning in a Digital World: The Future of Distance Learning. London: International Thomson Computer Press, 1996.
MLA-viite (9. p.)Collis, Betty. Tele-learning in a Digital World: The Future of Distance Learning. International Thomson Computer Press, 1996.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.