1. Barai, B. (2018). A study on effectiveness of learning physical science through activity-based methods at secondary level in Alipurduar district of West Bengal. International Journal of Creative Research Thoughts, 6(1), 289-294. http://doi.one/10.1729/IJCRT.17295
2. Bland, J. M., & Altman, D. G. (1997). Statistics notes: Cronbach’s alpha. BMJ, 314(7080), 572. https://doi.org/10.1136/bmj.314.7080.572
3. Bradley, E. H., Curry, L. A., & Devers, K. J. (2007). Qualitative data analysis for health services research: developing taxonomy, themes, and theory. Health Services Research, 42(4), 1758-1772. https://doi.org/10.1111/j.1475-6773.2006.00684.x
4. Brousseau, G. (1997). Theory of didactical situations in mathematics. Kluwer.
5. Campbell, D. T., & Stanley, J. C. (1963). Experimental and quasi-experimental designs for research. Rand McNally & Company.