1. Towards a more rigorous analysis of foreign language errors;Abbot;IRAL,1980
2. Error Tagging Manual;Dagneaux,1996
3. The Study of Second Language Acquisition;Ellis,1994
4. Learner English around the world;Granger,1996
5. The computer learner corpus: a versatile new source of data for SLA research;Granger,1998