https://archive.org/details/b2spiritstealthb0000hami/page/12/mode/2up
https://archive.org/details/insidestealthbom0000scot/page/n11/mode/2up?view=theater
https://www.af.mil/About-Us/Fact-Sheets/Display/Article/2682973/b-21-raider/
https://archive.org/details/insidestealthbom0000swee/page/12/mode/2up
https://archive.org/details/stealthbomber0000swee/page/n5/mode/2up
https://ia803104.us.archive.org/28/items/6549373-Air-Force-B-21-Raider-Long-Range-Strike-Bomber/6549373-Air-Force-B-21-Raider-Long-Range-Strike-Bomber.pdf
https://crsreports.congress.gov/product/pdf/R/R44463?source=GovD
https://www.airandspaceforces.com/article/the-case-for-the-b-21-raider/
https://nationalinterest.org/blog/reboot/bombs-away-why-b-2-stealth-bomber-wins-wars-198254
https://www.airandspaceforces.com/b-21-bomber-shelter-may-reveal-size-of-secret-jet/#:~:text=Based%20on%20these%20dimensions%2C%20the%20B-21%E2%80%99s%20wingspan%20could,150%20feet%20and%20a%20length%20of%2055%20feet.
https://archive.org/details/aerofax-extra-004-northrop-b-2-stealth-bomber./page/2/mode/2up
https://archive.org/details/b-2-a-spirit-units-in-combat-thomas-withington-2006/page/8/mode/2up
https://www.af.mil/About-Us/Fact-Sheets/Display/Article/2682973/b-21-raider/
https://www.forbes.com/sites/lorenthompson/2019/11/08/ten-things-we-know-for-sure-about-the-air-forces-secret-b-21-bomber/?sh=2f594bb71caf
https://www.aljazeera.com/news/2022/12/1/what-we-know-about-new-us-b-21-stealth-bomber-first-in-30-years
https://www.stripes.com/news/portable-b-2-bomber-shelters-are-built-in-parts-officially-unknown-1.1054
https://nationalinterest.org/blog/reboot/pay-price-americas-unstoppable-b-2-stealth-bomber-did-not-come-cheap-199018
https://www.popularmechanics.com/military/aviation/a38005873/pentagon-balloons-strattolite/
https://powerstarinc.com/gedms.html
https://web.archive.org/web/20060204082244/http://nuclearweaponarchive.org/Usa/Weapons/B83.html
https://web.archive.org/web/20200215190559/https://pdfs.semanticscholar.org/81d2/cef59b611d653b022d451b8d687ba3df5e47.pdf
https://asiatimes.com/2022/09/b-2-bomber-upgrades-send-a-message-to-china/
https://www.airforce-technology.com/news/usafs-b2a-b6112-jta-rats/#:~:text=Known%20as%20Radar%20Aided%20Targeting,positioning%20system%20(GPS)%20availability.
https://crsreports.congress.gov/product/pdf/RL/RL33640/67
http://historyoftech.mcclurken.org/b2bomber/cost/
https://www.ainonline.com/aviation-news/defense/2013-01-18/us-air-force-committed-long-range-strike-bomber
https://www.defensenews.com/air/2023/03/16/b-21-first-flight-running-a-few-months-behind/
https://www.northropgrumman.com/what-we-do/air/b-2-stealth-bomber/10-cool-facts-about-the-b-2/
https://archive.org/details/b-2-a-spirit-units-in-combat-thomas-withington-2006/page/30/mode/2up?view=theater
https://www.foxnews.com/world/b-2-bombers-kill-nearly-100-isis-terrorists-in-libya
https://www.forbes.com/sites/niallmccarthy/2020/11/26/the-mammoth-cost-of-operating-americas-combat-aircraft-infographic/?sh=3ab305c37da7