Flores, L. A., A. C. Presto, J. E. A. Combo, J. G. Caballero, V. D. Palanas, R. A. Devis, and L. E. Elipane. “Learnings from Conducting an Online Lesson Study for the Online Teaching of Radian Measure ”. International Journal of Multidisciplinary: Applied Business and Education Research, Vol. 3, no. 11, Nov. 2022, pp. 2440-5, doi:10.11594/ijmaber.03.11.27.