1. Chen, C.M., Chung, C.J.: Personalized mobile English vocabulary learning system based on item response theory and learning memory cycle. Comput. Educ. 51(2), 624–645 (2008)
2. Liu, P.-L.: Mobile English vocabulary learning based on concept-mapping strategy. Lang. Learn. Technol. 20(3), 128–141 (2016)
3. Wilkins, D.A.: Linguistics in Language Teaching, vol. 4, p. 12. Edward Arnold, London (1972)
4. Oxford, R.L.: Language Learning Strategies: What Every Teacher Should Know, vol. 5, p. 18. Newbury House, New York (1990)
5. Schmitt, N.: Review article: instructed second language vocabulary learning. Lang. Teach. Res. 14(4), 347–34 (2010)