1. Alhinty, M. (2015). English-language learning at their fingertips. International Journal of Mobile and Blended Learning, 7(2), 45–63. https://doi.org/10.4018/ijmbl.2015040104
2. Arispe, K., & Burston, J. (2017). Making it personal: Performance-based assessments, ubiquitous technology, and advanced learners. Language Learning and Technology, 21(3), 44–58.
3. Bassey, M. (1999). Case study research in educational settings. Open University Press.
4. BERA (2018). Ethical guidelines. http://www.ethics.napier.ac.uk/wiki/Main_Page
5. Biber, D., Conrad, S., & Leech, G. (2011). Student grammar of spoken and written English. Longman.