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पंक्ति 13:
 
== बाहरी कड़ियाँ ==
* [http://www.iftomm.org/iftomm/proceedings/proceedings_WorldCongress/WorldCongress07/articles/sessions/papers/A112.pdf 1 Astronomical Instruments In Ancient India] (Shekher Narveker)
* [[Midhat J. Gazalé|Gazalé, Midhat J.]] ''Gnomons, from Pharaohs to Fractals'', Princeton University Press, Princeton, 1999. ISBN 0-691-00514-1.
* {{Harvard reference
"https://hi.wikipedia.org/wiki/शंकुक" से प्राप्त