Bindhy Wasini Pandey, Natural Resource Management, Mittal Publications, 2005, ISBN 978-81-7099-986-7, "... The Ridge and its neighbouring hilly tracts represent the natural flora. The major natural forests in Delhi are generally restricted to the Ridge. The natural flora is a tropical, thorny and secondary forest."
Geological Survey of India, Records of the Geological Survey of India, Volum. 5-7, Government of India, 1872, "... These ridges are prolongations of the Aravali mountain system, and are approximately on the line of the Indo-gangetic watershed ..."
Lindsay Brown, Amelia Thomas, Rajasthan, Delhi and Agra, Lonely Planet, 2008, ISBN 978-1-74104-690-8, "... Delhi lies on the vast flatlands of the Indo-Gangetic Plain, though the northernmost pimples of the Aravallis amount to the Ridge, which lies west of the city centre ..."
