https://www.mensxp.com/special-features/today/42244-5-stories-of-pure-valor-of-the-best-snipers-in-world-history.html

https://www.wearethemighty.com/articles/the-5-most-legendary-snipers-of-all-time

https://www.warhistoryonline.com/world-war-ii/deadliest-sniper-history-simo-hayha.html

https://www.businessinsider.com/five-of-the-best-snipers-of-all-time-2017-5#3-us-army-staff-sgt-adelbert-waldron-3

https://www.military.com/off-duty/2019/05/16/5-most-legendary-snipers-all-time.html

https://www.historyextra.com/period/second-world-war/worlds-deadliest-sniper-simo-hayha-finnish-white-death-winter-war/

https://owlcation.com/humanities/Top-Ten-Deadliest-Snipers-in-History

https://listverse.com/2009/11/13/top-10-snipers-in-history/

https://allthatsinteresting.com/simo-hayha


https://allthatsinteresting.com/billy-sing

https://www.awm.gov.au/learn/schools/resources/case-studies/billy-sing

https://allthatsinteresting.com/matthaus-hetzenauer

https://ww2gravestone.com/matthaus-hetzenauer-austrian-sniper-wehrmacht/

https://www.cbc.ca/2017/canadathestoryofus/the-deadliest-sniper-of-wwi-was-francis-pegahmagabow-an-ojibwa-soldier-1.4083644

http://themedalhound.com/snipers/okhlopkov.html

http://www.snipercentral.com/adelbert-f-waldron-iii/

http://www.mercenarysniper.com/adelbert-waldron-.html

https://russiapedia.rt.com/prominent-russians/military/vasily-zaitsev/

https://stalingradfront.com/articles/articles-about-stalingrad-battle/zaytsev/

https://www.history.co.uk/article/lyudmila-pavlichenko-lady-death-historys-deadliest-female-sniper

https://www.mentalfloss.com/article/565151/retrobituaries-lyudmila-pavlichenko

https://www.biography.com/military-figure/chris-kyle

https://www.belfasttelegraph.co.uk/news/world-news/us-forced-to-import-bullets-from-israel-as-troops-use-250000-for-every-rebel-killed-28580666.html