1. Acharya, Pt. S. S. (2003). Eternity of Sound and the Science of Mantras. Haridwar: Yugantar Chetna Press.
2. Alper, H. P. (Ed.) (1988). Mantra. New York: SUNY Press.
3. Aurobindo, S. (1995). Savitri a legend and a symbol and letters on savitri, book IV canto III (p. 426). Pondicherry: Lotus Press. ISBN 0-941524-80-9.
4. Brown, K. W., & Ryan, R. M. (2003). The benefits of being present: Mindfulness and its role in psychological wellbeing. Journal of Personality and Social Psychology, 84(4), 822–848. doi:
10.1037/00223514.84.4.822
.
5. Devi, H. J., Swamy, N. V. C., & Nagendra, H. R. (2004). Spectral analysis of the vedic mantra Omkara. Indian Journal of Traditional Knowledge, 3(2), 154–161.