1. Alqahtani, M. (2015). The importance of vocabulary in language learning and how to be taught. International Journal of Teaching and Education, 3(3), 21-34, https://doi.org/10.20472/TE.2015.3.3.002
2. Ames, H., Glenton, C. & Lewin, S. Purposive sampling in a qualitative evidence synthesis: a worked example from a synthesis on parental perceptions of vaccination communication. BMC Med Res Methodol, 19 (26), 1-9. https://doi.org/10.1186/s12874-019-0665-4
3. Barnard, D. (2021, March 3). How to Develop Effective Verbal Communication Skills. https://virtualspeech.com/blog/verbal-communication-skills
4. Brandon, D. (2021, March 26). The Importance of Reading Comprehension. https://www.aces.edu/blog/topics/home-family-urban/the-importance-of-reading-comprehension/?fbclid=IwAR2yHe0pVkun6Xd70GxTuAKlrvF7hpjo1cUNPrhaaNzrslFEES9KGXO0VcM
5. Braze, J., Hoissan, M. (2015). The impact of storytelling techniques through virtual instruction on English 'students' speaking ability. Teaching English with Technology. 16 (1), 24-36, https://files.eric.ed.gov/fulltext/EJ1170637.pdf