Tyagi, Chanchal, and Pradeep Kumar Misra. 2022. “TEACHER PROFESSIONAL DEVELOPMENT PRACTICES IN ANCIENT INDIA: EVIDENCE FROM UPANISHADS (C.800 BCE - C.500 BCE)”. International Journal of Research -GRANTHAALAYAH 10 (5):139-53. https://doi.org/10.29121/granthaalayah.v10.i5.2022.4620.