Śaṅkarācārya, Ānandagiri, Edward Röer, Rājendralāla Mitra, and Edward B. Cowell. 1931. The Twelve Principal Upanishads. English Translation with Notes from the Commentaries of Sankarācārya and the Gloss of Ānandagiri. Published by Tookaram Tatya, for the Bombay Theosophical Publication Fund.