Encyclopædia Britannica, "Seljuq", Online Edition, (LINKArchived 2007-12-19 at the Wayback Machine): "... Because the Turkish Seljuqs had no Islamic tradition or strong literary heritage of their own, they adopted the cultural language of their Persian instructors in Islam. Literary Persian thus spread to the whole of Iran, and the Arabic language disappeared in that country except in works of religious scholarship ..."
cambridge.org
assets.cambridge.org
Fleet, Kate (2009). The Cambridge History of Turkey: Byzantium to Turkey, 1071–1453: Volume 1(PDF). Cambridge University Press. p. 1. "The defeat in August 1071 of the Byzantine emperor Romanos Diogenes by the Turkomans at the battle of Malazgirt (Manzikert) is taken as a turning point in the history of Anatolia and the Byzantine Empire."
M.A. Amir-Moezzi, "Shahrbanu", Encyclopaedia Iranica, Online Edition, (LINKArchived 2007-03-11 at the Wayback Machine): "... here one might bear in mind that Turco-Persian dynasties such as the Ghaznavids, Seljuqs and Ilkhanids were rapidly to adopt the Persian language and have their origins traced back to the ancient kings of Persia rather than to Turkish heroes or Muslim saints ..."
Osman Gazi Özgüdenli (2016). "MÛSÂ YABGU". TDV Encyclopedia of Islam, Supplement 2 (Kâfûr, Ebü'l-Misk – Züreyk, Kostantin) (in Turkish). Istanbul: Turkiye Diyanet Foundation, Centre for Islamic Studies. pp. 324–325. ISBN978-975-389-889-8.
Encyclopædia Britannica, "Seljuq", Online Edition, (LINKArchived 2007-12-19 at the Wayback Machine): "... Because the Turkish Seljuqs had no Islamic tradition or strong literary heritage of their own, they adopted the cultural language of their Persian instructors in Islam. Literary Persian thus spread to the whole of Iran, and the Arabic language disappeared in that country except in works of religious scholarship ..."
M.A. Amir-Moezzi, "Shahrbanu", Encyclopaedia Iranica, Online Edition, (LINKArchived 2007-03-11 at the Wayback Machine): "... here one might bear in mind that Turco-Persian dynasties such as the Ghaznavids, Seljuqs and Ilkhanids were rapidly to adopt the Persian language and have their origins traced back to the ancient kings of Persia rather than to Turkish heroes or Muslim saints ..."
wikipedia.org
tr.wikipedia.org
Zahîrüddîn-i Nîsâbûrî, Selcûḳnâme, (Muhammed Ramazânî Publications), Tahran 1332, p. 10.