1. University of Pennsylvania, Ms. Coll 390, Item 1243 Title: Brahmasūtramitākṣarā Author: Annambhatta Date: circa 1650-1799.
2. University of Pennsylvania, Ms. Coll 390, Item 3050 Title: Brahmasūtramitākṣarā Author: Vijñāneśvara Date: 1776.