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Handbook on Quality and Standardisation in E-Learning

By Ehlers, Ulf-Daniel.. Berlin, Heidelberg : Springer Berlin Heidelberg, 2006 9783540327882

By Ehlers, Ulf-Daniel.. Berlin, Heidelberg : Springer Berlin Heidelberg, 2010 9783642035821

By Ehlers, Ulf-Daniel.. . XVIII, 239 p. 38 illus. 9783642381744

By Ehlers, Ulf-Daniel.. . X, 610p. 60 illus. 9783642035821