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E. Bruce Goldstein (2010). Encyclopedia of Perception. SAGE Publications. p. 492. ISBN 978-1-4129-4081-8.
Chad Meister (2016). Philosophy of Religion. Palgrave Macmillan. pp. 11–12. ISBN 978-1-137-31475-8.;
Hans H Hock (2005). Edwin Francis Bryant and Laurie L. Patton (ed.). The Indo-Aryan Controversy: Evidence and Inference in Indian History. Routledge. p. 282. ISBN 978-0-7007-1463-6.
