1. Cognitive psychology and its implications;Anderson,1985
2. Increasing metacognitive awareness in the L2 classroom by using think-aloud protocols and other verbal report formats;Anderson,1996
3. Essentials of human memory;Baddeley,1990
4. British Academic Spoken English (BASE) corpus. Available from the Oxford Text Archive (http://ota.ahds.ac.uk/).
5. Cambridge ESOL (2005) Cambridge IELTS 4. Cambridge: Cambridge University Press.