18. University of Pennsylvania, Ms. Coll 390, Item 917 Title: Taittirīyopaniṣadbhāṣyavārttika Author: Ādi Shankara Date: 1792.
19. University of Pennsylvania, Ms. Coll 390, Item 934 Title: Māṇḍūkyopaniṣadbhāṣya Author: Ādi Shankara Date: circa 1700-1850.