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Booth, M. (2019, April 15). Columbine High School shooting plot planned for more than a year. The Denver Post. https://www.denverpost.com/1999/04/25/columbine-high-school-shooting-plot-planned/%C2%A0

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Densley, J., Peterson, J., & US, T. C. (2024, February 20). What we know about mass school shootings--and shooters--in the U.S. Scientific American. https://www.scientificamerican.com/article/what-we-know-about-mass-school-shootings-mdash-and-shooters-mdash-in-the-u-s/

https://www.vpc.org/studies/wgun990420.htm

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Columbine Killers’ “Basement tapes” destroyed in 2011, records request reveals. Colorado Freedom of Information Coalition. (2015, February 2). https://coloradofoic.org/news/columbine-killers-basement-tapes-destroyed-2011-records-request-reveals/

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Achenbach, J., & Russakoff, D. (1999, April 29). Washingtonpost.com: Teen Shooter’s life paints antisocial portrait. Teen Shooter’s life paints antisocial portrait. https://www.washingtonpost.com/wp-srv/national/daily/april99/antisocial04299.htm

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http://www.acolumbinesite.com/

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https://www.fbi.gov/video-repository/echoes-of-columbine-2019a.mp4/view 

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https://www.theguardian.com/world/2009/apr/25/dave-cullen-columbine

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https://extras.denverpost.com/news/shot0504l.htm 

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https://abcnews.go.com/US/20-years-columbine-changed-school-shootings-america/story?id=62248885

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http://www.acolumbinesite.com/after/dpotragedy.html

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https://patimes.org/the-columbine-generation/

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https://www.businessinsider.com/how-columbine-changed-american-schools-forever-2019-4

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