References
[1]. Adams, R., & Newton, J. (2009). TBLT in Asia: Constraints and opportunities. Asian Journal of English Language Teaching, 19(1), 1-17.
[2]. Ahour, T., & Dogolsara, S. A. (2015). The effect of task type on Iranian advanced EFL learners' vocabulary learning. Theory and Practice in Language Studies, 5(3), 657-664. https://doi.org/10.17507/tpls.0503.29
[3]. Aslan, Y. (2011). Teaching vocabulary effectively through flashcards. International Journal of Arts and Sciences, 4(11), 347-352.
[4]. Baleghizadeh, S., & Ashoori, A. (2011). The impact of two instructional techniques on EfL learners' vocabulary knowledge: Flashcards versus word lists. MEXTESOL Journal, 35(2), 1-9.
[5]. Brown, H. D. (2007). Principles of Language Learning and Leaching (3rd Ed.). White Plains, NY: Pearson Education, Inc.
[6]. Creswell, J. W. (2014). Research Design: Qualitative, Quantitative, and Mixed Methods Approaches (4th Ed.). Thousand Oaks, California: SAGE Publications.
[7]. Dörnyei, Z. (2010). Research Methods in Applied Linguistics: Quantitative, Qualitative, and Mixed Methodologies (4th Ed). Oxford: Oxford University Press.
[8]. Eggen, P., & Kauchak, D. (2001). Educational Psychology: Windows on Classrooms (5th Ed.). Upper Saddle River, NJ: Merrill Prentice Hall.
[9]. Elgort, I. (2007). The role of intentional decontextualised leanring in second language vocabulary acquisition: Evidence from primed lexical decision tasks with advanced bilinguals (Doctoral dissertation), Victoria University of Wellington, New Zealand.
[10]. Ellis, R. (2000). Task-based research and language pedagogy. Language Teaching Research, 4(3), 193-220. https://doi.org/10.1177/136216880000400302
[11]. Ellis, R. (2003). Task-Based Language Learning and Leaching. Oxford: Oxford University Press.
[12]. Fielding, N. G. (2012). Triangulation and mixed methods designs: Data integration with new research technologies. Journal of Mixed Methods Research, 6(2), 124-136. https://doi.org/10.1177/1558689812437101
[13]. Fitzpatrick, T., Al-Qarni, I., & Meara, P. (2008). Intensive vocabulary learning: A case study. Language Learning Journal, 36(2), 239-248. https://doi.org/10.1080/ 09571730802390759
[14]. Gay, L. R., Mills, G. E., & Airasian, P. (2009). Educational Research: Competencies for Analysis and Applications (9th Ed.). Upper Saddle River, New Jersey: Merrill/Pearson.
[15]. Insaniyah, I. (2008). The use of flashcards in teaching English for the sixth year students of SDN 1 Tuntang in the academic year of 2002-2003. Register Journal, 2(2), 161- 171. http://dx.doi.org/10.18326/rgt.v1i2.169-180
[16]. Jeon, I., & Hahn, J. (2006). Exploring EFL teachers' perceptions of task-based language teaching: A case study of Korean secondary school classroom practice. Asian EFL Journal, 8(1), 123-143.
[17]. Komachali, M. E., & Khodareza, M. (2012). The effect of using vocabulary flash card on Iranian pre-university students' vocabulary knowledge. International Education Studies, 5(3), 134-147. https://doi.org/10.5539/ies. v5n3p134
[18]. Laufer, B., & Nation, P. (1999). A vocabulary size test of controlled productive ability. Language Testing, 16(1), 33- 51. https://doi.org/10.1177/026553229901600103
[19]. Le, T. N., & Nguyen, H. B. (2012). Task-based language learning and student motivation in vocabulary acquisition. Language Education in Asia, 3(1), 106-120. https://doi.org/10.5746/LEiA/12/V3/I1/A10/Thanh_Huan
[20]. McShane, S. (2005). Applying research in reading instruction for adults: First steps for teachers. Louisville, KY: National Center for Family Literacy.
[21]. Miles, K. P., & Ehri, L. C. (2017). Learning to read words on flashcards: Effects of sentence contexts and word class in native and nonnative English speaking kindergarteners. Early Childhood Research Quarterly, 41(4), 103-113. https://doi.org/10.1016/j.ecresq.2017.06.001
[22]. Mitchell, D. D. (2006). Flashcard: Alternating between visible and invisible identities. Equity and Excellence in Education, 39(2), 137-145.
[23]. Mondria, J. A., & Mondria-Devries, S. (1994). Efficiently memorizing words with the help of word cards and "hand computer": Theory and applications. System, 22(1), 47-57. https://doi.org/10.1016/0346-251X(94) 90039-6
[24]. Nakata, T. (2013). Optimising Second Language Vocabulary Learning from Flashcards (Doctoral dissertation), Victoria University of Wellington.
[25]. Nation, I. S. P. (2001). Learning Vocabulary in Another Language. Cambridge: Cambridge University Press.
[26]. Newton, J. (2013). Incidental vocabulary learning in classroom communicative tasks. Language Teaching Research, 17(2), 164-187. https://doi.org/10.1177/ 1362168812460814
[27]. Nguyen, H. B., & Nguyen, A. H. (2018). Task-based vocabulary instruction at a Vietnamese high school: Students' perceptions. European Journal of English Language Teaching, 3(3), 1-20. https://doi.org/10.5281/ zenodo.1137595
[28]. Nikoopour, J., & Kazemi, A. (2014). Vocabulary learning through digitized and nondigitized flashcards delivery. Procedia Social and Behavioral Sciences, 98, 1366-1373. https://doi.org/10.1016/j.sbspro.2014.03.554
[29]. Nugroho, Y. S., Nurkamto, J., & Sulistyowati, H. (2012). Improving students' vocabulary mastery using flashcards. English Education, 1(1).
[30]. Oxford, R. L., & Burry-Stock, J. A. (1995). Assessing the use of language learning strategies worldwide with the ESL/EFL version of strategy inventory for language learning. System, 23(1), 1-23. https://doi.org/10.1016/0346-251 X(94)00047-A
[31]. Papadopoulou, E. (2007). The Impact of Vocabulary Instruction on the Vocabulary Knowledge and Writing Performance of Third Grade Students (Doctoral Dissertation), University of Maryland, USA.
[32]. Pham, H. T., & Nguyen, H. B. (2018). Teachers' perceptions about PowerPoint use as an ICT tool for teaching vocabulary in Vietnam. European Journal of English Language Teaching, 3(4), 104-119. https://doi.org/ 10.5281/zenodo.1466108
[33]. Pham, N. T. H., & Nguyen, H. B. (2017). Text-based vocabulary instruction on EFL reading comprehension. European Journal of English Language Teaching, 3(1), 39- 59. https://doi.org/10.5281/zenodo.883618
[34]. Rao, V. S., & Narayana, P. S. (1994). Organisational Behaviour: Kornark Publishers.
[35]. Richards, J. C., Gallo, P. B., & Renandya, W. A. (2001). Exploring teachers' beliefs and the processes of change. PAC Journal, 1(1), 41-58.
[36]. Richards, J. C., & Renandya, W. A. (2002). Methodology in Language Teaching: An Anthology of Current Practice. Cambridge University Press.
[37]. Schmitt, N. (2000). Vocabulary in Language Teaching. Cambridge: Cambridge University Press.
[38]. Schmitt, N., & Schmitt, D. (1995). Vocabulary notebooks: Theoretical underpinnings and practical suggestions. ELT Journal, 49 (2), 133-143. https://doi.org/10.1093/elt/49.2.133
[39]. Stutz, H. (1992). Flashcards: Fast and fun. Hispania, 75(5), 1323-1325. https://doi.org/10.2307/344401
[40]. Tan, A., & Nicholson, T. (1997). Flashcards revisited: Training poor readers to read words faster improves their comprehension of text. Journal of Educational Psychology, 89(2), 276-288. http://dx.doi.org/10.1037/0022- 0663.89.2.276
[41]. Terrell, S. R. (2012). Mixed-methods research methodologies. The Qualitative Report, 17(1), 254-280.
[42]. Wahyuni, S., & Yulaida, H. (2014). Flashcards as a means to improve EFL learners' vocabulary mastery. Journal of English Education and Linguistics Studies, 1(1), 47-61. https://doi.org/10.30762/jeels.v1i1.35
[43]. Wang, Y. (2018). Vocabulary Learning Strategies of Students Learning Chinese as a Foreign Language in an Intensive Training Setting. (Doctoral disseration), University of San Francisco, USA.
[44]. Ward, M., Grinstein, G., & Keim, D. (2015). Interactive Data Visualization: Foundations, Techniques and nd Applications (2 Ed.). New York: A K Peters/ CRC Press.
[45]. Wardani, N. M. (2015). Teaching Vocabulary To Young Learners Using Flashcard AT BA Aisyiyah Kadilangu In 2014/2015 Academic Year (Doctoral dissertation), Universitas Muhammadiyah Surakarta.
[46]. Webb, S. A. (2002). Investigating the Effects of Learning Tasks on Vocabulary knowledge (Doctoral disseration), Victoria University of Wellington, New Zealand.
