| Cassie Wycoff, , USA: Livestock and Forage Agent, Page 2 | in Browne 1899:409f or in Munis al-ahrar Ross 1927:436 |
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| Christopher Decker, University of Virginia Press, 1997 , xv; "The Saljuq Turks had invaded the province of Khorasan in the 1030s, and the city of Nishapur surrendered to them voluntarily in 1038 | Peter Avery and John Heath-Stubbs, The Ruba'iyat of Omar Khayyam, Penguin Group, 1981 , 14; "These dates, 1048—1031, tell us that Khayyam lived when the Saljuq Turkish Sultans were extending and consolidating their power over Persia and when the effects of this power were particularly felt in Nishapur, Khayyam's birthplace |
, Omar Khayyam: astronomer, mathematician and poet, Bulletin of the John Rylands Library.
17| Cambridge University Press 1975 : Richard Nelson Frye• Clolorado State University, , Colorado: Clolorado State University, Page 1-2 | |
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| The Earliest Account of 'Umar Khayyam | Bulletin of the School of Oriental Studies, University of London, 5 3 , 467—473 |
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