Upanishads The Holy Spirit of Vedas Author:F. Max Muller This volume contains eleven classical upanishads selected by Adi Sankaracharya: They are..Isha,Kena,Katha,Mundak,Prashna,Aitareya,Kaushitaki,Taittiriya,Shvetasshwatara,Chhandogya and Brihadaranyaka.