Ahmed, S. (2015). Attitudes towards English language learning among EFL learning at UMSKAL. Journal of Education and Practice, 16(18), 6-16.
Dominguez, R., & Pessoa, S. (2005). Early versus late start in foreign language education: Documenting achievements. Foreign Language Annuals, 38(4), 473-483.
Fathman, A. (1975). The relationship between age and second language productive ability. Language Learning, 25(2), 245-253.
Gardner, R. C. (1985). Social psychology and second language learning. Great Britain: Edward Arnold.
Gorjian, B., Mahmoudi, Kh., & Mir, F. (2010). Students’ individual differences and its relationship with English language learning. Journal of Social Science, 8, 111-130.
Gursoy, E. (2011). The critical period hypothesis revisited: The implications for current foreign language teaching to young learners. Journal of Language Teaching and Research, 2(2), 757-762.
Johnoson, J. S., & Newport, E. L. (1989). Critical period effects in second-language learning: The influence of maturational state on the acquisition of English as a second language. Cognitive Psychology, 21, 60-99.
Karahan, F. (2007). Language attitudes of Turkish students towards the English language and its use in Turkish context. Journal of Arts and Sciences, 7, 73-87.
Khalifa Gawi, E. M. (2012). The effects of age factor on learning English: A case study of learning English in Saudi Schools. English Language Teaching, 5(1), 127-139.
Marinova-Todd, S. H., Bradford Marshall, D., & Snow, C. E. (2000). Three misconceptions about age and L2 learning. TESOL Quarterly, 34(1), 9-34.
Noels, K. A., Pelletier, L. G., Clement, R., & Vallerand, R. J. (2000). Why are you learning a second language? Motivational orientations and self-determination theory. Language Learning, 50, 57-85.
Kocaman, O., & Kocaman, N. (2012). Age factor in foreign language education at preschool level. Procedia-Social and Behavioral Sciences, 55, 168-177.
Li, Q. (2014). Research on age-related in foreign language learning. International Journal of Language and Linguistics, 2(1), 31-37.
Saif, A. A. (2016). Measuring, assessing and educational evolution. (6th ed.). Tehran: Doran.
Snow, E. C., & Hoefnagel-Hohle, M. (1978). The critical period for language acquisition: Evidence from second language learning. Child Development, 49, 114-1128.
Yang, X. (2012). Attitudes and motivation in L2 learning among University of Malaya master students. International Journal of Management and Sustainability, 1(1), 13-22.
Zainol Abidin, M. J., Pour-Mohammadi, M., & Alzawari, H. (2012). EFL students’ attitudes towards learning English language: The case of Libyan secondary school students. Asian Social Science, 8(2), 119-134.