Johnson, D.W., & Johnson, R. (1989). Cooperation and Competition: Theory and Research. Edina, MS: Interaction Book Company, as cited in Fogarty, R. (1995) Best Practices for the Learner-Centered Classroom. Palatine, IL: IRI/Skylight Publishing.
Palloff, R., & Pratt, K. (2001). The virtual student: A profile and guide to working with online learners. San Francisco: Jossey-Bass.
Ritter, S. (2008). Social networking in higher education, Terra Incognita, Retrieved April 14, 2009 from http://blog.worldcampus.psu.edu/index.php/2008/09/04/social-networking-in-higher-education/
Wenger, E. (1999). Communities of Practice. Learning, meaning and identity, Cambridge: Cambridge University Press.