Collection of sources; individual chapter authors and dates are recorded below.
Publisher: National Council of Educational Research and Training.
This source is credited to an organization.
Online text: ncert.nic.in/textbook/pdf/leph104.pdf
First edition December 2006; revised edition November 2022; the linked chapter is marked Reprint 2026–27. The issuing body is NCERT; no individual chapter byline is asserted.
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