1. References marked with an asterisk indicate studies in the meta-analysis.
2. Abrami, P. C., & Bures, E. M. (1996). Computer-supported collaborative learning and distance education. American Journal of Distance Education, 10(2), 37–42.
3. Abrami, P. C., Chambers, B., Poulsen, C., De Simone, C., d'Apollonia, S., & Howden, J. (1995). Classroom connections: Understanding and using cooperative learning. Toronto, Ontario, Canada: Harcourt-Brace.
4. Abrami, P.C., Cohen, P., & d'Apollonia, S. (1988). Implementation problems in meta-analysis. Review of Educational Research, 58(2), 151–179.
5. Anderson, T. (2003). Models of interaction in distance education: Recent developments and research questions. In M. G. Moore and W. G. Anderson, (Eds.), Handbook of Distance Education. Mahwah, HJ: Lawrence Erlbaum Associates.