1. 1. Stanley C, Ward LM, Enns JT. Sensation and Perception. 5th ed., Harcourt Brace; 1999. p. 9. ISBN 0-470-00226-3.
2. 2. Fried Y, Josseph A. Paranoia: A Study in Diagnosis (Boston Studies in the Philosophy and History of Science), vol. 50, Dordrecht: Reidel; 1976.
3. 3. Sharma PH. Editor and hindi commentator. Kaashyap Samhita, Indriyasthana. 10th ed., Varanasi: Chaukhambha Sanskrit Sansthan; 2005. pp. 98–105.
4. 4. Pandit Kashinath Shastri, Hindi commentator. Charaka Samhita of Agnivesha, Sharira Sthana, Ch. 2, Ver. 29, 1st ed., Varanasi: Chowkhamba Sanskrit Series Office; 1969. p. 731.
5. 5. Subramania SV. Bhela Samhita, Sharira Stana, Ch. 3, Ver. 2-4, New Delhi: CCRIM; 1997. p. 175.