4Anonymous (2007).Speakers' biographies [EB/OL].Retrieved on 5 February 2007. <http://sell.hil.no/icde_scop/keynote.html#sewart>.
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8David Sewart (1993).Student support systems in distance educatlon[J].Open Learning, 1993,8(3):3-12.
9David Sewart(1998 ).Tuition and counselling: Supporting teachers for competitive advantage [A]. C. Latchem and F. Lockwood (Eds.). Staff development in opeu and flexible learning [C]. London: Routledge, 1998:148-156.
