1. Abu-Humeid, A., & Altai, A. (2013). Refusal Strategies Used by Iraqi EFL University Students. British Journal of Science, 8(1), 58-86.
2. Alfattah Mohammed, H. A. (2010). Apology Strategies of Yemeni EFL University Students. University of Mysore, Mysore, India, 27.
3. Bataineh, R. F. (2013). On Congratulating, Thanking, and Apologizing in Jordanian Arabic and American English. Journal of Intercultural Communication, 15.
4. Bataineh, R. F., & Bataineh, R. F. (2008). A cross-cultural comparison of apologies by native speakers of American English and Jordanian Arabic. Journal of Pragmatics, 40(4), 792-821.
5. Bergman, M. and Kasper, G. (1993) Perception and Performance in Native and Non-Native Apology. In: Gabrielle, K. and Shohona, B., Eds., Interlanguage Pragmatics, Oxford University Press, Oxford, 82-117.