Aghlara, L., & Tamjid, N. H. (2011). The effect of digital games on Iranian children′s vocabulary retention in foreign language acquisition. Procedia-Social and Behavioral Sciences, 29, 552-560.
Azher, M., Anwar, M. N., & Naz, A. (2010). An investigation of foreign language classroom anxiety and its relationship with students′ achievement. Journal of College Teaching and Learning, 7(11), 33.
Bandura, A. (1977). Self-efficacy: toward a unifying theory of behavioral change. Psychological review, 84(2), 191.
Butler, Y. G. (2015). The use of computer games as foreign language learning tasks for digital natives. System, 54, 91-102.
Charsky, D. (2010). From edutainment to serious games: A change in the use of game characteristics. Games and culture.
Chen, C. M., & Lee, T. H. (2011). Emotion recognition and communication for reducing second‐language speaking anxiety in a web‐based one‐to‐one synchronous learning environment. British Journal of Educational Technology, 42(3), 417-440.
Cheng, C. H., & Su, C. H. (2012). A Game-based learning system for improving student′s learning effectiveness in system analysis course. Procedia-Social and Behavioral Sciences, 31, 669-675.
Chen, H. H. J. (2011). Developing and evaluating an oral skills training website supported by automatic speech recognition technology. ReCALL, 23(01), 59-78.
Chiu, Y. H., Kao, C. W., & Reynolds, B. L. (2012). The relative effectiveness of digital game‐based learning types in English as a foreign language setting: A meta‐analysis. British Journal of Educational Technology, 43(4), E104-E107.
Erhel, S., & Jamet, E. (2013). Digital game-based learning: Impact of instructions and feedback on motivation and learning effectiveness. Computers & Education, 67, 156-167.
Furió, D., GonzáLez-Gancedo, S., Juan, M. C., Seguí, I., & Rando, N. (2013). Evaluation of learning outcomes using an educational iPhone game vs. traditional game. Computers & Education, 64, 1-23.
Heidari, F., Izadi, M., & Ahmadian, M. V. (2012). The relationship between Iranian EFL learners′ self-efficacy beliefs and use of vocabulary learning strategies. English Language Teaching, 5(2), 174.
Hetthong, R., & Teo, A. (2013). Does Writing Self-efficacy Correlate with and Predict Writing Performance?. International Journal of Applied Linguistics and English Literature, 2(1), 157-167.
Horwitz, E. K., Horwitz, M. B., & Cope, J. (1986). Foreign language classroom anxiety. The modern language journal, 70(2), 125-132.
Huang, W. H., Huang, W. Y., & Tschopp, J. (2010). Sustaining iterative game playing processes in DGBL: The relationship between motivational processing and outcome processing. Computers & Education, 55(2), 789-797.
Hung, H. C., Young, S. S. C., & Lin, C. P. (2015). No student left behind: a collaborative and competitive game-based learning environment to reduce the achievement gap of EFL students in Taiwan. Technology, Pedagogy and Education, 24(1), 35-49.
Hwang, W. Y., Shih, T. K., Ma, Z. H., Shadiev, R., & Chen, S. Y. (2016). Evaluating listening and speaking skills in a mobile game-based learning environment with situational contexts. Computer Assisted Language Learning, 29(4), 639-657.
Hwang, G. J., & Wu, P. H. (2012). Advancements and trends in digital game‐based learning research: a review of publications in selected journals from 2001 to 2010. British Journal of Educational Technology, 43(1), E6-E10.
Hwang, G. J., Wu, P. H., & Chen, C. C. (2012). An online game approach for improving students’ learning performance in web-based problem-solving activities. Computers & Education, 59(4), 1246-1256.
Khodadady, E., & Khajavy, G. H. (2013). Exploring the role of anxiety and motivation in foreign language achievement: A structural equation modeling approach. Porta Linguarum: revista internacional de didáctica de las lenguas extranjeras, (20), 269-286.
Liu, T. Y., & Chu, Y. L. (2010). Using ubiquitous games in an English listening and speaking course: Impact on learning outcomes and motivation. Computers & Education, 55(2), 630-643.
Naseri, M., & Zaferanieh, E. (2012). The relationship between reading self-efficacy beliefs, reading strategy use and reading comprehension level of Iranian EFL learners. World Journal of Education, 2(2), 64.
Oxford, R. L. (1999). Anxiety and the language learner: New insights. Affect in language learning, 58-67.
Öztürk, G., & Gürbüz, N. (2014). Speaking anxiety among Turkish EFL learners: The case at a state university. Journal of Language and Linguistic Studies, 10(1), 1-17.
Pavlas, D. (2010). A model of flow and play in game-based learning: The impact of game characteristics, player traits, and player states (Doctoral dissertation, University of Central Florida Orlando, Florida).
Raoofi, S., Tan, B. H., & Chan, S. H. (2012). Self-efficacy in second/foreign language learning contexts. English Language Teaching, 5(11), 60.
Rahimi, A., & Abedini, A. (2009). The interface between EFL learners′ self-efficacy concerning listening comprehension and listening proficiency. Novitas-Royal, 3(1), 14-28.
Ronimus, M., Kujala, J., Tolvanen, A., & Lyytinen, H. (2014). Children′s engagement during digital game-based learning of reading: The effects of time, rewards, and challenge. Computers & Education, 71, 237-246.
Shah, P. M., Mahmud, W. H., Din, R., Yusof, A., & Pardi, K. M. (2011). Self-efficacy in the writing of Malaysian ESL learners. World Applied Sciences Journal (Innovation and Pedagogy for Lifelong Learning), 15, 08-11.
Shkullaku, R. U. D. I. N. A. (2013). The relationship between self-efficacy and academic performance in the context of gender among Albanian students. European Academic Research, 1(4), 467-478.
Sila, A.Y., 2010. Young adolescent students’ foreign language anxiety in relation to language skills at different levels. The Journal of International Social Research, 3 (11), 83-91.
Siritararatn, N. (2013). English self-efficacy beliefs of EFL low proficiency graduate students. Academic Journal of Interdisciplinary Studies, 2(3), 461.
Spielberger, C. D. (1983). Manual for the state-trait anxiety inventory (STAI). Palo Alto, CA: Consulting Psychologists Press.
Tsai, F. H., Yu, K. C., & Hsiao, H. S. (2012). Exploring the factors influencing learning effectiveness in digital game-based learning. Journal of Educational Technology & Society, 15(3), 240-250.
Tilfarlioglu, F. Y., & Ciftci, F. S. (2011). Supporting self-efficacy and learner autonomy in relation to academic success in EFL classrooms (a case study). Theory and Practice in Language Studies, 1(10), 1284-1294.
Wang, Y. H., Young, S. S. C., & Jang, J. S. R. (2013). Using Tangible Companions for Enhancing Learning English Conversation. Educational Technology & Society, 16(2), 296-309.
Woodrow, L. (2011). College English writing affect: Self-efficacy and anxiety. System, 39(4), 510-522.
Yang, J. C., Quadir, B., & Chen, N. S. (2016). Effects of the Badge Mechanism on Self-Efficacy and Learning Performance in a Game-Based English Learning Environment. Journal of Educational Computing Research, 54(3), 371-394.
Yun, J., & Sohn, H. (2012). A Study of the Relationship between L2 Learners’ Language Anxiety and Proficiency. Foreign Languages Education, 19, 81-100.
Zhang, X. (2013). Foreign language listening anxiety and listening performance: Conceptualizations and causal relationships. System, 41(1), 164-177.
Zhao, A., Guo, Y., & Dynia, J. (2013). Foreign language reading anxiety: Chinese as a foreign language in the United States. The Modern Language Journal, 97(3), 764-778.