| Savage-Smith, Emilie 1985 , Islamicate Celestial Globes: Their History, Construction, and Use, Smithsonian Institution Press, Washington, D | Computing in the Soviet Space Program Translation from Russian: Slava Gerovitch |
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| David Woodward 1989 , "The Image of the Spherical Earth", 25: 3—15 [9]• | "", by Michael Kimmelman, September 18, 2007 |
Covington, Richard 2007 , , May—June 2007: 17—21, , retrieved on 2008-07-06• Meri, Jere L Bacharach, page 138-139 - available via google books -• Kazi, Najma 24 November 2007.
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