1. Alonso Ramos M. Wanner L. Vincze O. Casamayor G. Vázquez N. Mosqueira E. &Prieto S.(2010). Towards a motivated annotation schema of collocation errors in learner corpora.Proceedings of the 7th conference on International Language Resources and Evaluation (LREC) La Valetta Malta 3209–3214.
2. American Council on the Teaching of Foreign Languages. (2012).ACTFL proficiency guidelines.http://actflproficiencyguidelines2012.org/
3. Formulaic language in second language pragmatics research