1. University of Pennsylvania, Ms. Coll 390, Item 883 Title: Īśopaniṣadbhāṣya Author: Ādi Shankara Date: circa 1700-1850.
2. University of Pennsylvania, Ms. Coll 390, Item 1152 Title: Īśopaniṣadbhāṣya Author: Ādi Shankara Date: circa 1700-1850.