1. Bean, J. C.(1996) Engaging ideas: the professors’ guide to integrating writing, critical thinking and active learning in the classroom. San Francisco CA: Jossey‐Bass Publishers.
2. Berg, B. A. M. van den.(2003) Peer assessment in universitair onderwijs. Een onderzoek naar bruikbare ontwerpen. [Peer assessment in university teaching. An exploration of useful designs]. Utrecht : Utrecht University. Dissertation
3. Creswell, J. W.(1998) Qualitative inquiry and research design: choosing among five traditions. Thousand Oaks CA: Sage Publications.
4. Flower, L. and Hayes, J. R. and Carey, L. and Schriver, K. and Stratman, J. (1986) Detection, diagnosis, and the strategies of revision College Composition and Communication, 37, pp. 16 - 55.
5. Lockhart, C. and Ng, P. (1995) Analyzing talk in ESL peer response groups: stances, functions and content Language Learning, 45, pp. 605 - 655.