1. Burley, Mikel. 2007. Classical Samkhya and yoga: An Indian metaphysics of experience. Oxon: Routledge.
2. Crowell, Steven. 2012. Transcendental phenomenology and the seductions of naturalism: Subjectivity, consciousness, and meaning. In Oxford handbook of contemporary phenomenology, ed. Dan Zahavi. Oxford: Oxford University Press.
3. Feuerstein Georg. 2002. The Yoga Tradition Its History Literature Philosophy and Practice. Delhi: Motilal Banarsidass.
4. Larson, James Gerald. 1979. Classical Sāṁkhya: An interpretation of its history and meaning. 2nd ed. New Delhi: Motilal Banarsidass.
5. Larson, J.G and Bhattacharya R.S. eds. 2008. The encyclopaedia of Indian philosophies, vol 12, Yoga: India’s philosophy of meditation. Princeton: Princeton University Press.