Isavasya Upanisad
Text and translation of this ancient Upanishad, one of the premier source texts of Vedanta. Isa Upanishad
English translation and commentary. Sri Isopanishad
One of the oldest and most important Upanishads. Original sanskrit with english translations and commentary. Realization.org: Isa Upanishad
An English translation of the Isa Upanishad by F. Max Mueller.