The principal Upanisads / Edited with introd., text, translation and notes by S. Radhakrishan. - London : G. Allen & Unwin , 1974 . - 958 p. 23 cm. - The Muirhead library of philosophy . - Library of philosophy. . Bibliography: p. 951-952. ISBN: 04294046X 042940478 LC Class. No.: BL1120.A3 Dewey Class. No.: 294.5