1. Ai, J., Pan, Y., & Zhong, W. (2021). The role of motivation in second language acquisition: a review. Advances in Social Science, Education and Humanities Research, 594. https://www.atlantis-press.com/proceedings/iclahd-21/125964829
2. Bernaus, M., & Gardner, R. C. (2008). Teacher motivation strategies, student perceptions, student motivation, and English achievement. The Modern Language Journal, 92(3), 387–401. http://www.jstor.org/stable/25173065
3. Brown, H. D. (1994). Principles of language learning and teaching. Prentice Hall Regents.
4. Brown, H. D. (2014). Principles of language learning and teaching: A course in second language acquisition. Pearson.
5. Dhaka Metropolitan Police. (1976). 1976 Metropolitan Police Ordinance III. https://dmp.gov.bd/dmpordinance/?fbclid=IwAR1Cc0tWAu7A_T3GF4HMRgd8hbPBxFfdrijwksbfkZ9A_kl1rtx-24Pg-qI