Bernaus, M., & Gardner, R. C. (2008). Teacher Motivation Strategies, Student Perceptions, Student Motivation, and English Achievement. The Modern Language Journal, 92(3), 387-401.
Dörnyei, Z. (2005). The Psychology of the Language Learner: Individual Differences in Second Language Acquisition. Mahwah, New Jersey: Lawrence Erlbaum Associates, Inc.
Ellis, R. (2008). The Study of second language acquisition. New York: Oxford University Press.
Febbraro, A., McKee, B. & Riedel, S. (2008): Multinational military operations and intercultural factors. North Atlantic treaty Organization, Research and Technology Organization: Neuilly-sur-Seine Cedex, France
Gardner, R.C. (1985). Social psychology and second language learning: The role of attitudes and motivation. London: Edward Arnold.
Gardner, R.C. (2001) Integrative motivation and second language acquisition. In Z. Dörnyei & R. Schmidt (Eds.), Motivation and Second Language Acquisition (Technical Report No. 23 , pp.1-19). Honolulu: University of Hawai‘i, Second Language Teaching and Curriculum Center.)
Masgoret, A. M.; Gardner, R. C. (2003) Attitudes, motivation and second language learning: A meta-analysis of studies conducted by Gardner and associates. Language Learning, 53, pp. 167-210.
Rost, M. (2006) Generating student motivation. Retrieved January, 2012, from
www.pearsonlongman.com/ae/worldview/motivation.pdf .
Shirbagi N. (2010) Orientations and attitudes Of Iranian University Students for English Language Learning. PEDAGOGIKA. 2010.99.
Stewart, K., Clarke, H., Goillau, P., Verrall, N. & Widdowson, M. (2004): Non-technical interoperability in multinational forces. In proceedings of the 9th international Command and Control Research and Technology Symposium, 14-16 September 2004. Copenhagen, Denmark.
Vaezi, Z. (2008) Language Learning Motivation among Iranian Undergraduate Students, World Applied Sciences Journal 5 (1): 54-61.
Yamashiro A.D.; McLaughlin J. (2001) Relationships among attitudes, motivation, anxiety, and English language proficiency in Japanese college students. In : Second Language Acquisition Research in Japan .Eds. P.Robinson, M. Sawyer, S. Ross. Tokyo: Japan Association for Language Teaching, pp. 113–127.