1. Azuma, R.T. (1997). A Survey of Augmented Reality Presence. Teleoperators and Virtual Environments 6, 4, 355-385.
2. Barab, S., & Duffy, T. (2000). From practice fields to communities of practice. Theoretical foundations of learning environments, 25.
3. Biocca F., et.al (1998). Virtual & Augmented Reality: 3D environments, avatars, and anthropomorphic agents, MediaInterface and Networking Design, Department of Telecommunication, Michigan State University, East Lansing, MI.
4. Canfield, D. (2008). Using Immersive Learning Environments in Foreign Language Classes: Second Life, CALICO 2008, 398.
5. Chan, J. (2008). Developing a Meaning-focused and Task-based Virtual Learning Reality, CALICO 2008.