S.К. Belvalkar, R.D. Ranade, History of Indian philosophy, vol. II, Poona, 1927.
U.C. Bhattacharjee, The home of the Upanishads, — «The Indian Antiquary», 1928, vol. 57, pp. 166–173, 185–189.
S.Ch. Chakravarti, The philosophy of the Upanishads, Calcutta, 1935.
В.K. Chattopadhyaya, The Upanishads and Vedic sacrifices, — JAS, vol. XVII, 1951, N 3, pp. 185–190 (то же: «Journal of the Bihar research Society», vol. 44, 1958, pt 3–4, pp. 129–136).
S. Dasgupta, A history of Indian philosophy, vol. I, Cambridge, 1922. P. Deussen, Die Philosophic der Upanishad's, 3. Aufl., Leipzig, 1919.
F. Edgerton, The Upanishads: what do they seek and why? — JAOS, vol. 49, 1929, pp. 97-121.
A.H. Ewing, The hindu conception of the functions of breath. A study in early Indian psycho-physics, — JAOS, 1931, vol. 22, pp. 249–308.
M. Falk, Upāsana et Upaniṣad, — RO 1937, t. XIII, pp. 129–158.
E. Frauwallner, Untersuchungen zu den älteren Upanishaden, — ZII, Bd 4, 1926, H. 1, S. 1-45.
К.V. Gajendragadkar, Neo-Upanishadic Philosophy, Bombay, 1959.
J.M. van Gelder, Der Atman in der Grossen-Wald-Geheimlehre, ’s-Gravenhage, 1957.
A.E. Gough, The philosophy of the Upanishads and ancient Indian metaphysics, London, 1903.
G.C.O. Haas, Recurrent and parallel passages in the principal Upanishads and the Bhagavadgītā. With references to other Sanskrit texts, — JAOS, 1922, vol. 42, pp. 1-43.
M.H. Harrison, Hindu monism and pluralism as found in the Upanishads and in the philosophies dependent upon them, Oxford, 1932.
F. Heller, Die Mystik in den Upanishaden, München, 1925.
B. Heimann, Studien zur Eigenart indischen Denkens, Tübingen, 1930.
A. Hillebrandt, Ober die Upanishaden, — «Zeitschrift fur Buddismus», IV. Jhrg., 1922, S. 39–51.
G.A. Jacob, A concordance to the principal Upanishads and Bhagavadgītā, Bombay, 1891.
Gh. Johnston, The dramatic element in the Upanishads, — «The Monist», 1910, vol. XX, pp. 185–216.
A.B. Keith, The religion and philosophy of the Veda and Upanishads, Cambridge, Mass., 1925.
B. Mal, The religion of Buddha and its relation to upaniṣadic thought, Hoshiarpur, 1958.
H. Oldenberg, Die Lehre der Upanishaden und die Anfänge des Buddhismus, Göttingen, 1923.
M.P. Pandit, The Upanishads. Gateways of knowledge, Madras, 1960.
K.A. Patwardhan, Upanishads and modern biology, Bombay, 1957.
S. Radhakrishnan, The philosophy of the Upanishads, London, 1935.
R.D. Ranade, A constructive survey of upanishadic philosophy being a systematic introduction to Indian metaphysics, Poona, 1926.
W. Rau, Bemerkungen zu Śañkaras Bṛhadāraṇyakopaniṣadbhāṣya, — «Paideuma», Bd 7, 1960, H. 4/6, S. 293–299.
L. Renou, Le passage des Brahmaṇa aux Upaniṣad, — JAOS, 1953,701.73, pp. 138–144.
L. Renou, Les relations du Śatapatha Brāhmaṇa avec la Brihadāraṇyaka Upaniṣad et la personnalité de Yājñavalkya, — «Indian Culture», XIV, 1948, pp. 75–89.
T.W. Rhys Dawids, The theory of «Soul» in the Upanishads, — JRAS, 1899, pp. 71–87.
W. Ruben, Die Philosophen der Upanishaden, Bern, 1947.
W. Ruben, Uddalaka and Yajnavalkya. Materialism and idealism, — «Indian studies. Past and present», 1962, vol. III, pp. 345–354.
W. Ruben, Über die Debatten in den alten Upaniṣad's, — ZDMG, NF, Bd 8 (Bd 83), 1929, S. 238–255.
S. Schayer, Über die Bedeutung des Wortes Upaniṣad, — RO, 1927, t. III pp. 57–67.
E. Senart, Upās-upaniṣad — в кн.: «Florilegium… Melchior de Vogüé», Paris, 1909, pp. 575–587.