Azevedo, R., & Winne, P. (2014). Metacognition. In R. K. Sawyer (Ed.), Cambridge Handbooks in Psychology. The Cambridge Handbook of the Learning Sciences (2nd ed., pp. 63–87). Cambridge University Press. https://doi.org/10.1017/CBO9781139519526.006

Brown, A. (1987). Metacognition, executive control, self-regulation, and other more mysterious mechanisms. In F. E. Weinert & R. Kluwe (Eds.), Metacognition, Motivation, and Understanding (pp. 65–116). Lawrence Erlbaum Associates, Inc.

Craig, K., Hale, D., Grainger, C., & Stewart, M. (2020). Evaluating metacognitive self-reports: systematic reviews of the value of self-report in metacognitive research. Metacognition and Learning, 15(2), 155–213. https://doi.org/10.1007/s11409-020-09222-y

The Douglas Fir Group (2016). A Transdisciplinary Framework for SLA in a Multilingual World. The Modern Language Journal, 100(S1), 19–47. https://doi.org/10.1111/modl.12301

Flavell, J. (1976). Metacognitive aspects of problem solving. In L. B. Resnick (Ed.), The nature of intelligence. Lawrence Erlbaum Associates, Inc.

Lakoff, G., & Johnson, M. (1980). Metaphors we live by. University of Chicago Press.

Marulis, L. (2014). Conceptualizing and Assessing Metacognitive Development in Young Children. Connecticut College.

Menezes Oliveira e Paiva, Vera Lucia (2014). What’s in a name? The quest for new metaphors for second language acquisition. Trabalhos Em Linguística Aplicada, 53(1), 145–162. https://doi.org/10.1590/S0103-18132014000100008

Paris, S., & Winograd, P. (1990). How Metacognition Can Promote Academic Learning and Instruction. In B. F. Jones & L. Idol (Eds.), Dimensions of thinking and cognitive instruction (pp. 15–51). Lawrence Erlbaum Associates, Inc.

Paris, S., & Winograd, P. (1990). Promoting Metacognition and Motivation of Exceptional Children. Remedial and Special Education, 11(6), 7–15. https://doi.org/10.1177/074193259001100604

Quinteros Ortiz, C. (2024). Multilingualism in metacognitive and self-regulation research: scoping review advocating for comprehensive representation of multilingual complexity. Árboles Y Rizomas, 6(2), 96–123. https://www.revistas.usach.cl/ojs/index.php/rizomas/article/view/6968/26005805

Sharifian, F., Sadeghpour, M., Barton, S.‑M., Barry, J., Barton, G., & Yilmaz, I. (2021). English language learning barriers of Afghan refugee women in Australia. International Journal of Applied Linguistics, 31(1), 65–78. https://doi.org/10.1111/ijal.12320

To get a general overview:

Anderson, N. (2009). Metacognition and good language learners. In C. Griffiths (Ed.), Lessons from Good Language Learners (pp. 99–109). Cambridge University Press. https://doi.org/10.1017/cbo9780511497667.010

Anderson, N. (2012). Metacognition: Awareness of Language Learning. In S. Mercer, S. Ryan, & M. Williams (Eds.), Psychology for Language Learning (pp. 169–187). Palgrave Macmillan UK. https://doi.org/10.1057/9781137032829_12

Azevedo, R. (2020). Reflections on the field of metacognition: issues, challenges, and opportunities. Metacognition and Learning, 15(2), 91–98. https://doi.org/10.1007/s11409-020-09231-x

Going deeper into how to measure these processes

Atsushi, M. (2018). On Questionnaire Use in Language Learning Strategies Research. The Journal of AsiaTEFL, 15(1), 184–192. https://doi.org/10.18823/asiatefl.2018.15.1.12.184

Balconi, M., Acconito, C., Allegretta, R., & Crivelli, D. (2023). What Is the Relationship between Metacognition and Mental Effort in Executive Functions? The Contribution of Neurophysiology. Behavioral Sciences, 13(11). https://doi.org/10.3390/bs13110918

Fleming, S., & Lau, H. (2014). How to measure metacognition. Frontiers in Human Neuroscience, 8, 1–9. https://doi.org/10.3389/fnhum.2014.00443

On multilingualism and its specific characteristics

Angelis, G. de (Ed.). (2007). Third or Additional Language Acquisition. Multilingual Matters. https://doi.org/10.21832/9781847690050

Aronin, L., & Hufeisen, B. (2009). The Exploration of Multilingualism (Vol. 6). John Benjamins Publishing Company. https://doi.org/10.1075/aals.6

Aronin, L., & Singleton, D. (2012). Multilingualism. Impact: Vol. 30. John Benjamins Pub. Co.