Roer, E. (1979). The twelve principal upanishads.
Chicago Style aipamenaRoer, E. The Twelve Principal Upanishads. New Delhi, Nag Publishers, 1979.
MLA aipamenaRoer, E. The Twelve Principal Upanishads. 1979.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.