MoryE. H. (2004). Feedback research revisited. In JonassenD. H. (Ed.), Handbook of research on educational communications and technology (pp. 745–783). Mahwah, NJ: Lawrence Erlbaum.
2.
PalloffR. M., & PrattK. (2007). Building online learning communities: Effective strategies for the virtual classroom.San Francisco, CA: Jossey-Bass.