1. Allwright, Richard L. and Kathleen M. Bailey. 1991. Focus on the language classroom: An introduction to classroom research for language teachers. Cambridge: Cambridge University Press.
2. Brock, Cynthia, Graham Crookes, Richard R. Day and Michael H. Long. 1986. Differential effects of corrective feedback in native speaker—nonnative speaker conversation. In Talking to learn: Conversation in second language acquisition, ed. Richard R. Day, 229–236. Rowley, MA: Newbury House.
3. Carroll, Susanne and Merrill Swain. 1993. Explicit and implicit negative feedback: An empirical study of the learning of linguistic generalizations. Studies in Second Language Acquisition 15: 357–366.
4. Chaudron, Craig. 1986. Teachers’ priorities in correcting learners’ errors in French immersion classes. In Talking to learn: Conversation in second language acquisition, ed. Richard R. Day, 64–84. Rowley, MA: Newbury House.
5. DeKeyser, Robert M. 1998. Beyond focus on form: Cognitive perspectives on learning and practicing second language grammar. In Focus on form in classroom second language acquisition, eds. Catherine J. Doughty and Jessica Williams, 42–63. Cambridge: Cambridge University Press.