Czwenar, I. (2014). Analysing spoken language for complexity, accuracy and fluency: Some methodological considerations. Cham: Springer International Publishing.
de Bot, K., Lowie, W., & Verspoor, M. (2005). Second language acquisition: An advanced resource book. London: Routledge.
Dods, A. (2017). Changes in complexity, accuracy and fluency in a Japanese first year university student’s oral production after study abroad. Bulletin of Toyo Gakuen University, 25, 279-295.
Ellis, R. (2003). Task-based language learning and teaching. Oxford: Oxford University Press.
Ellis, R. (2009). The differential effects of three types of task planning on the fluency, complexity, and accuracy in L2 oral production. Applied Linguistics, 30(4), 474-509. doi: 10.1093/applin/amp042
Ellis, R., & Barkhuizen, G. (2005). Analysing learner language. Oxford: Oxford University Press.
Faul, F. (2014). G*Power (Version 22.214.171.124). Germany: University of Kiel.
Foster, P., & Skehan, P. (1996). The Influence of planning and task type on second language performance. Studies in Second Language Acquisition, 18(3), 299-323. doi: 10.1017/s0272263100015047
Foster, P., Tonkyn, A., & Wigglesworth, G. (2000). Measuring spoken language: A unit for all reasons. Applied Linguistics, 21(3), 354-375. doi: 10.1093/applin/21.3.354
Freed, B. F., Dewey, D. P., Segalowitz, N., & Halter, R. (2004). The language contact profile. Studies in Second Language Acquisition, 26(2). doi: 10.1017/s027226310426209x
Fulcher, G. (2003). Testing second language speaking. London: Longman.
Housen, A., & Kuiken, F. (2009). Complexity, accuracy, and fluency in second language acquisition. Applied Linguistics, 30(4), 461-473. doi: 10.1093/applin/amp048
Housen, A., Kuiken, F., & Vedder, I. (2012). Complexity, accuracy and fluency: Definitions, measurement and research. In A. Housen, F. Kuiken & I. Vedder (Eds.), Dimensions of L2 performance and proficiency (pp. 1-20). Amsterdam: John Benjamins.
Larsen-Freeman, D., & Long, M. H. (1991). An introduction to second language acquisition research. London: Longman.
Latham-Koenig, C., & Oxenden, C. (2014). American English file (2nd ed.). New York, NY: Oxford University Press.
Lee, J.-A. (2009). Teachers’ sense of efficacy in teaching English, perceived English language proficiency, and attitudes toward the English language: A case of Korean public elementary school teachers. (Doctoral dissertation), The Ohio State University. Retrieved from https://etd.ohiolink.edu/
MacWhinney, B. (2000). The CHILDES project: Tools for analyzing talk (3rd ed.). New York, NY: Psychology Press.
McKee, G., Malvern, D., & Richards, B. (2000). Measuring vocabulary diversity using dedicated software. Literary and Linguistic Computing, 15(3), 323-338. doi: 10.1093/llc/15.3.323
Mora, J. C., & Valls-Ferrer, M. (2012). Oral fluency, accuracy, and complexity in formal instruction and study abroad learning contexts. TESOL Quarterly, 46(4), 610-641. doi: 10.1002/tesq.34
Munoz, C. (2014). Contrasting effects of starting age and input on the oral performance of foreign language learners. Applied Linguistics, 35(4), 463-482. doi: 10.1093/applin/amu024
Newton, J., & Kennedy, G. (1996). Effects of communication tasks on the grammatical relations marked by second language learners. System, 24(3), 309-322. doi: 10.1016/0346-251x(96)00024-3
Norris, J. M., & Ortega, L. (2009). Towards an organic approach to investigating CAF in istructed SLA: The case of complexity. Applied Linguistics, 30(4), 555-578. doi: 10.1093/applin/amp044
Pérez-Vidal, C., & Juan-Garau, M. (2011). The effect of context and input conditions on oral and written development: A Study abroad perspective. International Review of Applied Linguistics in Language Teaching, 49(2), 157-185. doi: 10.1515/iral.2011.008
Richards, J. C. (2014). The ELT textbook. New York, NY: Palgrave Macmillan.
Saslow, J. M., & Ascher, A. (2012). Summit 2 (2nd ed.). White Plains NY: Pearson Education.
Skehan, P. (1998). Task-based instruction. Annual Review of Applied Linguistics, 18, 268-286. doi: 10.1017/s0267190500003585
Skehan, P. (2001). Tasks and language performance assessment. In M. Bygate, P. Skehan & M. Swain (Eds.), Researching pedagogic tasks: Second language learning, teaching, and testing (pp. 167-185). London: Longman.
Skehan, P., & Foster, P. (1997). Task type and task processing conditions as influences on foreign language performance. Language Teaching Research, 1(3), 185-211. doi: 10.1177/136216889700100302
Soars, L., Soars, J., Hancock, P., & Williamson, M. (2015). New Headway English course (4th ed.). Oxford: Oxford University Press.
Tavakoli, P., & Foster, P. (2008). Task design and second language performance: The effect of narrative type on learner output. Language Learning, 58(2), 479-473. doi: 10.1111/j.1467-9922.2008.00446.x
Thornbury, S. (2014). English language teaching textbooks: Content, consumption, production. ELT Journal, 69(1), 100-102. doi: 10.1093/elt/ccu066
Towell, R., & Hawkins, R. (1994). Approaches to second language acquisition. Clevedon: Multilingual Matters.
Verspoor, M., Lowie, W., & van Dijk, M. (2008). Variability in second language development from a dynamic systems perspective. The Modern Language Journal, 92(2), 214-231. doi: 10.1111/j.1540-4781.2008.00715.x
Yuan, F., & Ellis, R. (2003). The Effects of pre-task planning and on-line planning on fluency, complexity and accuracy in L2 monologic oral production. Applied Linguistics, 24(1), 1-27. doi: 10.1093/applin/24.1.1
Zedeck, S. (2014). APA dictionary of statistics and research methods. Washington, DC: American Psychological Association.