Balbir Singh. (1983). The philosophy of Upanishads. Arnold-Heinemann.
Lua i Stíl Chicago (17ú heag.)Balbir Singh. The Philosophy of Upanishads. New Delhi: Arnold-Heinemann, 1983.
Lua MLA (8ú heag.)Balbir Singh. The Philosophy of Upanishads. Arnold-Heinemann, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.