Robert Hume, Shvetashvatara Upanishad, The Thirteen Principal Upanishads, Oxford University Press, pages 399, 403
Gregor Maehle (2009), Ashtanga Yoga, New World, ISBN 978-1577316695, page 17; for Sanskrit, see: Skanda Purana Shankara Samhita Part 1, Verses 1.8.20-21 (Sanskrit)
Long, J. Bruce (1971). “Siva and Dionysos: Visions of Terror and Bliss”. Numen18 (3): 180. doi:10.2307/3269768.
[a] A Kunst, Some notes on the interpretation of the Ṥvetāṥvatara Upaniṣad, Bulletin of the School of Oriental and African Studies, Vol. 31, Issue 02, June 1968, pages 309-314; doi:10.1017/S0041977X00146531; [b] Doris Srinivasan (1997), Many Heads, Arms, and Eyes, Brill, ISBN 978-9004107588, pages 96-97 and Chapter 9
The Trimurti idea of Hinduism, states Jan Gonda, "seems to have developed from ancient cosmological and ritualistic speculations about the triple character of an individual god, in the first place of Agni, whose births are three or threefold, and who is threefold light, has three bodies and three stations". See: Jan Gonda (1969), The Hindu Trinity, Anthropos, Bd 63/64, H 1/2, pages 218-219; Other trinities, beyond the more common "Brahma, Vishnu, Shiva", mentioned in ancient and medieval Hindu texts include: "Indra, Vishnu, Brahmanaspati", "Agni, Indra, Surya", "Agni, Vayu, Aditya", "Mahalakshmi, Mahasarasvati, and Mahakali", and others. See: [a] David White (2006), Kiss of the Yogini, University of Chicago Press, ISBN 978-0226894843, pages 4, 29 [b] Jan Gonda (1969), The Hindu Trinity, Anthropos, Bd 63/64, H 1/2, pages 212-226
Manju Bhatnagar (1988). “The Monsoon Festival Teej in Rajasthan”. Asian Folklore Studies47 (1): 63–72. JSTOR1178252.