1. Ariffin, A (2021). Effects of Student Collaboration on ESL Learners' Vocabulary Development. Asian Journal of University Education (AJUE) 17(1), 177-191. DOI:10.24191/ajue.v17i1.12627
2. Bahramlou, K., & Yazdani, H. (2013). Using Vocabulary Profiles to Predict Academic Achievement. The Iranian EFL Journal. 9(5). 265-281.
3. Barcroft, J., Schmitt, N., & Sunderman, G. (2011). Lexis. In J. Simpson (Ed.), The Routledge Handbook of Applied Linguistics (pp. 571-583). Abingdon, UK/New York: Routledge.
4. BC (nd). Ministry of Education And Training General Education English Language Curriculum (Issued with the Circular No. 32/2018/TT-BGDDT dated December 26, 2018, of the Minister of Education and Training). Retrieved on September 20, 2022, from https://www.britishcouncil.org/sites/default/files/english_language_grade_3_12_2018-eng_translation.pdf
5. Chirobocea-Tudor, Olivia. (2018). Vocabulary Acquisition in ESP. Perspectives, Strategies and Resources. Studii si Cercetari Filologice: Seria Limbi Straine Aplicate. 171-180.