ISAVASYA or ISA-UPANISHAD
KHANDOGYA-UPANISHAD TALAVAKARA-UPANISHAD (or KENA-UPANISHAD) AITAREYA-ARANYAKA KAUSHITAKI-UPANISHAD KATHA-UPANISHAD MUNDAKA-UPANISHAD TAITTIRIYAKA-UPANISHAD BRIHADARANYAKA-UPANISHAD SVETASVATARA UPANISHAD PRASNA-UPANISHAD MAITRAYANA-BRAHMAYA-UPANISHAD