১। https://www.financialexpress.com/business/railways-indian-railways-kavach-system-good-progress-made-in-implementation-of-kavach-on-rail-network-says-ashwini-vaishnaw-3382279/
২। https://pib.gov.in/PressReleaseIframePage.aspx?PRID=1945084
৩। https://www.businesstoday.in/amp/india/story/indian-railways-to-roll-out-tender-for-10000-km-of-kavach-433487-2024-06-16
৪। https://www.livemint.com/news/india/indian-railways-rs-5-000-crore-tender-kavach-safety-signalling-system-train-accidents-11718599503060.html
৫। https://www.businesstoday.in/markets/stocks/story/kernex-microsystems-hbl-power-systems-shares-rally-up-to-10-heres-why-384197-2023-06-05
৬। https://www.wsj.com/market-data/quotes/IN/XBOM/517271/company-people#:~:text=The%20company%20was%20founded%20by,is%20headquartered%20in%20Hyderabad%2C%20India.
৭। https://www.nytimes.com/1996/11/12/world/spies-can-t-even-trust-the-other-side-anymore.html
৮। https://www.indiatoday.in/magazine/international/story/19951130-espionage-case-sends-jitters-through-indian-community-in-us-808000-1995-11-29
৯। https://www.dhra.mil/PERSEREC/Espionage-Cases/1993-95/