Kulke, Hermann.A history of India. — 4, illustrated. — Routledge, 2004. — С. 432 pages.. — «In 9th century the Gurjara Pratiharas kings, Bhoja (836—885) and Mahendrapala (885—910), proved to be more powerful than their contemporaries of the other two dynasties whom they defeated several times. Kannauj then emerged as the main focus of power in India.».
Chopra, Pran Nath.A comprehensive history of ancient India. — Sterling Publishers Pvt. Ltd, 2003. — С. 196.. — «Al-Masudi who visited his (Gurjara Mahipala) court, also refers to the great power and resources of the Gurjara pratihara rules of Kannauj.».
