4Sasha Barab. (2006). Design-Based Research : A Methodological Toolkit for the Learning Scientist. In R. Keitb Saw- yer(Ed. ), The Cambridge Handbook of the Learning Sciences (153-- 171). Cambridge University Press.
5Singh H, Reed C. A white paper: Achieving success with blended learning[OL]. <http://www.centra.com/download/whitepapers/blendedlearning.pdf>.
6Merrill M D. First principles of instruction[J]. Educational Technology: Research and Development,2002,(3):43-59.