1. AbdelWahab, M. M. (2014). The effectiveness of using the cooperative language learning approach to enhance EFL writing skills among Saudi University students. Journal of Language Teaching and Research, 5(3), 616–625 https://pdfs.semanticscholar.org/eb7e/498cb50d1e8f6dd9e0cfa2997c99829b8969.pdf.
2. Alias, N. S., Hussin, H., Mohamed Adnan, N. S., Othman, M. H., & Hussin, K. (2018). Perception of teacher on CL. Paper presented in Malaysia Technical Universities Conference on Engineering and Technology (MUCET 2017) https://research.ump.edu.my/index.php/en/12-news/482-mucet-2017.
3. Alkhatib, A. B. (2012). The effect of using brainstorming strategy in developing creative problem solving skills among female students in princess Alia University college. American International Journal of Contemporary Research, 2(10), 29–38 https://www.aijcrnet.com/journals/Vol_2_No_10_October_2012/4.pdf.
4. Allen, D. (2004). Oxford placement test 2: Test pack. Oxford: Oxford University Press https://www.worldcat.org/title/oxford-placement-test-2/oclc/37559978/editions?referer=di&editionsView=true.
5. Ameri-Golestan, A., & Dousti, E. (2015). Collaborative versus individual task planning and Iranian EFL learners’ writing performance. International Journal of Foreign Language Teaching & Research, 3(12), 25–40 http://jfl.iaun.ac.ir/article_13807.html.