ISBN 0-595-20284-5* "The Upanishads" by Sri Aurobindo [http://www.sriaurobindoashram.info/Contents.aspx?ParentCategoryName=_StaticContent/SriAurobindoAshram/-09%20E-Library/-01%20Works%20of%20Sri%20Aurobindo/-12_The%20Upanishad_Volume-12].
ISBN 0-595-20284-5*"The Upanishads" by Sri Aurobindo [http://www.sriaurobindoashram.info/Contents.aspx?ParentCategoryName=_StaticContent/SriAurobindoAshram/-09%20E-Library/-01%20Works%20of%20Sri%20Aurobindo/-12_The%20Upanishad_Volume-12].