Basics
Imported print text
                              S.M.Srinivasa Chari, The Philosophy of the Upaniṣads: A Study Based on the Evluation of the Comments of Śaṃkara, Rāmānuja and Madhva. New Delhi 2002
Imported raw data
                              379.67.822 S.M.Srinivasa Chari, The Philosophy of the Upaniṣads: A Study Based on the Evluation of the Comments of Śaṃkara, Rāmānuja and Madhva. New Delhi 2002
References
Source refers to  (3)