1. Archaeological Survey of India
http://asi.nic.in/about-us/
2. Revenue Generated through Entry Fee for Ticketed Monuments of ASI Trebles in Three Years
https://www.business-standard.com/article/news-cm/revenue-generated-through-entry-fee-for-ticketed-monuments-of-asi-trebles-in-three-years-118121800761_1.html
3. 13 More Monuments May Be Ticketed to Stop Vandals
https://timesofindia.indiatimes.com/city/delhi/13-more-monuments-may-be-ticketed-to-stop-vandals/articleshow/7892253.cms
4. Amid Encroachments and Vandalism, 18th Century Zafar Mahal in Sorry State
https://indianexpress.com/article/cities/delhi/amid-encroachments-and-vandalism-18th-century-zafar-mahal-in-sorry-state-2767644/