↑Knut Jacobsen, Theory and Practice of Yoga, Motilal Banarsidass, ISBN978-8120832329, pages 100-101
↑"Samkhya", American Heritage Dictionary of the English Language, Fifth Edition (2011), Quote: "Samkhya is a system of Hindu philosophy based on a dualism involving the ultimate principles of soul and matter."
↑"Samkhya", Webster's College Dictionary (2010), Random House, ISBN978-0375407413, Quote: "Samkhya is a system of Hindu philosophy stressing the reality and duality of spirit and matter."