Tripathi, Dwijendra (1984). Business Communities of India: A Historical Perspective. New Delhi, India, Asia: Manohar. pp.106: In 1340 A.D. when Muhammad Tughlak marched against Kondana, a hill fort near Pune, the chief of the fort whom he defeated was one Nag Naik, a Koli chieftain. ISBN978-0-8364-1276-5.
Sinha, Kunal (2002). An Ordinary Traveller. New Delhi, India, Asia: Bluejay Books. pp.152: Tribal Koli chief, Nag Naik defended the fort for nine months against the forces of Muhammad-bin-Tughlak. Centuries later, Shivaji's general, Tanaji Malasure Koli. ISBN978-81-87075-83-7.
State), Bombay (India (1954). Gazetteer of Bombay State: Poona District. New Delhi, India, Asia: Printed at the Government Central Press. pp.682: The old name of the fort, until it was changed by Sivaji in 1647 to Sinhagada, was Kondhānā. There is a village of the name Kondanpur at the foot of the fort. In 1340 a Koli chieftain called Nāg Näik resisted Muhammad Tughlak (1325-51) for eight monthe ot Sinhagada Kondhana ne the Runa forte.
